UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

(Rule 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO

§ 240.13d-2(a)

(Amendment No.  )1

Integrated Device Technology, Inc.

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

458118106

(CUSIP Number)

JEFFREY C. SMITH

STARBOARD VALUE LP

830 Third Avenue, 3rd Floor

New York, New York 10022

(212) 845-7977

STEVEN WOLOSKY, ESQ.

OLSHAN GRUNDMAN FROME ROSENZWEIG & WOLOSKY LLP

Park Avenue Tower

65 East 55th Street

New York, New York 10022

(212) 451-2300

(Name, Address and Telephone Number of Person

Authorized to Receive Notices and Communications)

April 9, 2012

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box ¨.

Note:  Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits.  See § 240.13d-7 for other parties to whom copies are to be sent.

_______________

1              The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION CAYMAN ISLANDS
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 5,385,774
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 5,385,774
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 5,385,774
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 3.8%
14	TYPE OF REPORTING PERSON CO

2

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON STARBOARD VALUE AND OPPORTUNITY S LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 1,483,324
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 1,483,324
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,483,324
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.0%
14	TYPE OF REPORTING PERSON OO

3

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON STARBOARD VALUE LP
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 9,200,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 9,200,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,200,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.5%
14	TYPE OF REPORTING PERSON PN

4

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON STARBOARD VALUE GP LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 9,200,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 9,200,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,200,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.5%
14	TYPE OF REPORTING PERSON OO

5

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON STARBOARD PRINCIPAL CO LP
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 9,200,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 9,200,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,200,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.5%
14	TYPE OF REPORTING PERSON PN

6

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON STARBOARD PRINCIPAL CO GP LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 9,200,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 9,200,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,200,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.5%
14	TYPE OF REPORTING PERSON OO

7

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON JEFFREY C. SMITH
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 9,200,000
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 9,200,000
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,200,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.5%
14	TYPE OF REPORTING PERSON IN

8

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON MARK R. MITCHELL
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 9,200,000
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 9,200,000
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,200,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.5%
14	TYPE OF REPORTING PERSON IN

9

CUSIP NO. 458118106

1	NAME OF REPORTING PERSON PETER A. FELD
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 9,200,000
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 9,200,000
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 9,200,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.5%
14	TYPE OF REPORTING PERSON IN

10

CUSIP NO. 458118106

The following constitutes the Schedule 13D filed by the undersigned (the “Schedule 13D”).

Item 1. Security and Issuer.

This statement relates to the common stock, par value $0.001 per share (the “Shares”), of Integrated Device Technology, Inc. (the “Issuer”).  The address of the principal executive offices of the Issuer is 6024 Silver Creek Valley Road, San Jose, California 95138.

Item 2. Identity and Background.

(a)           This statement is filed by:

(i) Starboard Value and Opportunity Master Fund Ltd, a Cayman Islands exempted company (“Starboard V&O Fund”), with respect to the Shares directly and beneficially owned by it;

(ii) Starboard Value and Opportunity S LLC, a Delaware limited liability company (“Starboard LLC”), with respect to the Shares directly and beneficially owned by it;

(iii) Starboard Value LP (“Starboard Value LP”), as the investment manager of Starboard V&O Fund and of a certain managed account (the “Starboard Value LP Account”) and the manager of Starboard LLC;

(iv) Starboard Value GP LLC (“Starboard Value GP”), as the general partner of Starboard Value LP;

(v) Starboard Principal Co LP (“Principal Co”), as a member of Starboard Value GP;

(vi) Starboard Principal Co GP LLC (“Principal GP”), as the general partner of Principal Co;

(vii) Jeffrey C. Smith, as a member of Principal GP and as a member of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP;

(viii) Mark R. Mitchell, as a member of Principal GP and as a member of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP; and

(ix) Peter A. Feld, as a member of Principal GP and as a member of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP.

Each of the foregoing is referred to as a “Reporting Person” and collectively as the “Reporting Persons.”  Each of the Reporting Persons is party to that certain Joint Filing Agreement, as further described in Item 6.  Accordingly, the Reporting Persons are hereby filing a joint Schedule 13D.

(b)           The address of the principal office of each of Starboard LLC, Starboard Value LP, Starboard Value GP, Principal Co, Principal GP, and Messrs. Smith, Mitchell and Feld is 830 Third Avenue, 3rd Floor, New York, New York 10022.  The address of the principal office of Starboard V&O Fund is 89 Nexus Way, Camana Bay, PO Box 31106, Grand Cayman KY1-1205, Cayman Islands.  The officers and directors of Starboard V&O Fund and their principal occupations and business addresses are set forth on Schedule A and are incorporated by reference in this Item 2.

11

CUSIP NO. 458118106

(c)           The principal business of Starboard V&O Fund is serving as a private investment fund.  Starboard V&O Fund has been formed for the purpose of making equity investments and, on occasion, taking an active role in the management of portfolio companies in order to enhance shareholder value.  Starboard LLC has been formed for the purpose of investing in securities and engaging in all related activities and transactions.  Starboard Value LP provides investment advisory and management services and acts as the investment manager of Starboard V&O Fund and the Starboard Value LP Account and the manager of Starboard LLC.  The principal business of Starboard Value GP is providing a full range of investment advisory, pension advisory and management services and serving as the general partner of Starboard Value LP.  The principal business of Principal Co is providing investment advisory and management services.  Principal Co is a member of Starboard Value GP.  Principal GP serves as the general partner of Principal Co.  Messrs. Smith, Mitchell and Feld serve as members of Principal GP and the members of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP.

(d)           No Reporting Person, nor any person listed on Schedule A, annexed hereto, has, during the last five years, been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

(e)           No Reporting Person, nor any person listed on Schedule A, annexed hereto, has, during the last five years, been party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

(f)           Messrs. Smith, Mitchell and Feld are citizens of the United States of America.  The citizenship of the persons listed on Schedule A is set forth therein.

Item 3. Source and Amount of Funds or Other Consideration.

The Shares purchased by each of Starboard V&O Fund and Starboard LLC and held in the Starboard Value LP Account were purchased with working capital (which may, at any given time, include margin loans made by brokerage firms in the ordinary course of business) in open market purchases, except as otherwise noted, as set forth in Schedule B, which is incorporated by reference herein.  The aggregate purchase price of the 5,385,774 Shares beneficially owned by Starboard V&O Fund is approximately $36,541,861, excluding brokerage commissions.  The aggregate purchase price of the 1,483,324 Shares beneficially owned by Starboard LLC is approximately $10,066,260, excluding brokerage commissions.  The aggregate purchase price of the 2,330,902 Shares held in the Starboard Value LP Account is approximately $15,819,549, excluding brokerage commissions.

Item 4. Purpose of Transaction.

The Reporting Persons purchased the Shares based on the Reporting Persons’ belief that the Shares, when purchased, were undervalued and represented an attractive investment opportunity.  Depending upon overall market conditions, other investment opportunities available to the Reporting Persons, and the availability of Shares at prices that would make the purchase or sale of Shares desirable, the Reporting Persons may endeavor to increase or decrease their position in the Issuer through, among other things, the purchase or sale of Shares on the open market or in private transactions or otherwise, on such terms and at such times as the Reporting Persons may deem advisable.

12

CUSIP NO. 458118106

No Reporting Person has any present plan or proposal which would relate to or result in any of the matters set forth in subparagraphs (a) - (j) of Item 4 of Schedule 13D except as set forth herein or such as would occur upon or in connection with completion of, or following, any of the actions discussed herein.  The Reporting Persons intend to review their investment in the Issuer on a continuing basis.  Depending on various factors including, without limitation, the Issuer’s financial position and investment strategy, the price levels of the Shares, conditions in the securities markets and general economic and industry conditions, the Reporting Persons may in the future take such actions with respect to their investment in the Issuer as they deem appropriate including, without limitation, engaging in communications with management and the Board of the Issuer, engaging in discussions with stockholders of the Issuer and others about the Issuer and the Reporting Persons’ investment, making proposals to the Issuer concerning changes to the capitalization, ownership structure, board structure (including seeking board representation) or operations of the Issuer, purchasing additional Shares, selling some or all of their Shares, engaging in short selling of or any hedging or similar transaction with respect to the Shares, or changing their intention with respect to any and all matters referred to in Item 4.

Item 5. Interest in Securities of the Issuer.

The aggregate percentage of Shares reported owned by each person named herein is based upon 141,392,129 Shares outstanding, as of January 29, 2012, which is the total number of Shares outstanding as reported in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on February 10, 2012.

A. Starboard V&O Fund

(a) As of the close of business on April 18, 2012, Starboard V&O Fund beneficially owned 5,385,774Shares.

Percentage: Approximately 3.8%

(b) 1. Sole power to vote or direct vote: 5,385,774

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 5,385,774

4. Shared power to dispose or direct the disposition: 0

(c) The transactions in the Shares by Starboard V&O Fund during the past 60 days are set forth in Schedule B and are incorporated herein by reference.

B. Starboard LLC

(a) As of the close of business on April 18, 2012, Starboard LLC beneficially owned 1,483,324Shares.

Percentage: Approximately 1.0%

(b) 1. Sole power to vote or direct vote: 1,483,324

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 1,483,324

4. Shared power to dispose or direct the disposition: 0

13

CUSIP NO. 458118106

(c) The transactions in the Shares by Starboard LLC during the past 60 days are set forth in Schedule B and are incorporated herein by reference.

C. Starboard Value LP

(a) As of the close of business on April 18, 2012, 2,330,902 Shares were held in the Starboard Value LP Account.  Starboard Value LP, as the investment manager of Starboard V&O Fund and the Manager of Starboard LLC, may be deemed the beneficial owner of the (i) 5,385,774Shares owned by Starboard V&O Fund and (ii) 1,483,324 Shares owned by Starboard LLC.

Percentage: Approximately 6.5%

(b) 1. Sole power to vote or direct vote: 9,200,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 9,200,000

4. Shared power to dispose or direct the disposition: 0

(c) The transactions in the Shares by Starboard Value LP through the Starboard Value LP Account and on behalf of each of Starboard V&O Fund and Starboard LLC during the past 60 days are set forth in Schedule B and are incorporated herein by reference.

D. Starboard Value GP

(a) Starboard Value GP, as the general partner of Starboard Value LP, may be deemed the beneficial owner of the (i) 5,385,774Shares owned by Starboard V&O Fund, (ii) 1,483,324 Shares owned by Starboard LLC and (iii) 2,330,902 Shares held in the Starboard Value LP Account.

Percentage: Approximately 6.5%

(b) 1. Sole power to vote or direct vote: 9,200,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 9,200,000

4. Shared power to dispose or direct the disposition: 0

(c) Starboard Value GP has not entered into any transactions in the Shares during the past 60 days.  The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard LLC and through the Starboard Value LP Account during the past 60 days are set forth in Schedule B and are incorporated herein by reference.

E. Principal Co

(a) Principal Co, as a member of Starboard Value GP, may be deemed the beneficial owner of the (i) 5,385,774 Shares owned by Starboard V&O Fund, (ii) 1,483,324 Shares owned by Starboard LLC and (iii) 2,330,902 Shares held in the Starboard Value LP Account.

Percentage: Approximately 6.5%

14

CUSIP NO. 458118106

(b) 1. Sole power to vote or direct vote: 9,200,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 9,200,000

4. Shared power to dispose or direct the disposition: 0

(c) Principal Co has not entered into any transactions in the Shares during the past 60 days.  The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard LLC and through the Starboard Value LP Account during the past 60 days are set forth in Schedule B and are incorporated herein by reference.

F. Principal GP

(a) Principal GP, as the general partner of Principal Co, may be deemed the beneficial owner of the (i) 5,385,774 Shares owned by Starboard V&O Fund, (ii) 1,483,324Shares owned by Starboard LLC and (iii) 2,330,902 Shares held in the Starboard Value LP Account.

Percentage: Approximately 6.5%

(b) 1. Sole power to vote or direct vote: 9,200,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 9,200,000

4. Shared power to dispose or direct the disposition: 0

(c) Principal GP has not entered into any transactions in the Shares during the past 60 days.  The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard LLC and through the Starboard Value LP Account during the past 60 days are set forth in Schedule B and are incorporated herein by reference.

G. Messrs. Smith, Mitchell and Feld

(a) Each of Messrs. Smith, Mitchell and Feld, as a member of Principal GP and as a member of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP, may be deemed the beneficial owner of the (i) 5,385,774Shares owned by Starboard V&O Fund, (ii) 1,483,324Shares owned by Starboard LLC and (iii) 2,330,902 Shares held in the Starboard Value LP Account.

Percentage: Approximately 6.5%

(b) 1. Sole power to vote or direct vote: 0

2. Shared power to vote or direct vote: 9,200,000

3. Sole power to dispose or direct the disposition: 0

4. Shared power to dispose or direct the disposition: 9,200,000

(c) None of Messrs. Smith, Mitchell or Feld has entered into any transactions in the Shares during the past 60 days.  The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard LLC and through the Starboard Value LP Account during the past 60 days are set forth in Schedule B and are incorporated herein by reference.

(d) No person other than the Reporting Persons is known to have the right to receive, or the power to direct the receipt of dividends from, or proceeds from the sale of, the Shares.

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CUSIP NO. 458118106

(e) Not applicable.

Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.

On April 19, 2012, the Reporting Persons entered into a Joint Filing Agreement in which the Reporting Persons agreed to the joint filing on behalf of each of them of statements on Schedule 13D with respect to the securities of the Issuer to the extent required by applicable law.  The Joint Filing Agreement is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Item 7. Material to be Filed as Exhibits.

99.1 Joint Filing Agreement by and among Starboard Value and Opportunity Master Fund Ltd, Starboard Value and Opportunity S LLC, Starboard Value LP, Starboard Value GP LLC, Starboard Principal Co LP, Starboard Principal Co GP LLC, Jeffrey C. Smith, Mark R. Mitchell and Peter A. Feld, dated April 19, 2012.

99.2 Power of Attorney for Jeffrey C. Smith, Mark Mitchell and Peter A. Feld, dated September 15, 2011.

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CUSIP NO. 458118106

SIGNATURES

After reasonable inquiry and to the best of his knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated:  April 19, 2012

STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD By: Starboard Value LP,        its investment manager   STARBOARD VALUE AND OPPORTUNITY S LLC By: Starboard Value LP,        its manager   STARBOARD VALUE LP By: Starboard Value GP LLC,        its general partner STARBOARD VALUE GP LLC By: Starboard Principal Co LP,        its member   STARBOARD PRINCIPAL CO LP By: Starboard Principal Co GP LLC,        its general partner   STARBOARD PRINCIPAL CO GP LLC

By:	/s/ Jeffrey C. Smith
	Name:	Jeffrey C. Smith
	Title:	Authorized Signatory

/s/ Jeffrey C. Smith

JEFFREY C. SMITH

Individually and as attorney-in-fact for Mark R. Mitchell and Peter A. Feld

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CUSIP NO. 458118106

SCHEDULE A

Directors and Officers of Starboard Value and Opportunity Master Fund Ltd

Name and Position	Principal Occupation	Principal Business Address	Citizenship
Patrick Agemian Director	Director of Global Funds Management, Ltd.	PO Box 10034, Harbour Place 2nd Floor 103 South Church Street Grand Cayman Cayman Islands, KY1-1001	Canada
Mark Mitchell Director*
Don Seymour Director	Managing Director of dms Management Ltd.	dms Management Ltd. dms House, 20 Genesis Close P.O. Box 31910 Grand Cayman Cayman Islands, KY1-1208	Cayman Islands

* Mr. Mitchell is a Reporting Person and, as such, the information with respect to Mr. Mitchell called for by Item 2 of Schedule 13D is set forth therein.

CUSIP NO. 458118106

SCHEDULE B

Transactions in the Shares During the Past 60 Days

Shares of Common Stock Purchased Price Per Share($) Date of Purchase

STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD

100,244	6.7323	02/09/2012
114,400	6.6572	02/10/2012
28,600	6.6972	02/13/2012
28,600	6.7562	02/13/2012
36,951	6.7262	02/13/2012
20,249	6.6770	02/14/2012
57,200	6.8133	02/15/2012
112,067	6.8114	02/15/2012
30,933	6.8931	02/16/2012
28,600	7.0159	02/16/2012
51,480	6.7931	02/22/2012
163,020	6.7831	02/22/2012
53,636	6.7800	02/23/2012
60,764	6.7548	02/24/2012
28,600	6.6865	02/27/2012
97,240	6.6865	02/27/2012
102,960	6.7185	02/27/2012
300,300	6.8638	02/28/2012
14,300	6.8108	02/28/2012
629,200	6.9514	02/29/2012
71,500	6.9500	02/29/2012
400,400	6.9522	02/29/2012
42,900	6.9233	02/29/2012
29,450	6.8800	03/01/2012
236,979	6.8656	03/01/2012
86,760	6.7600	03/02/2012
235,811	6.6306	03/02/2012
29,450	6.5700	03/02/2012
16,492	6.3800	03/05/2012
130,758	6.4250	03/05/2012
44,175	6.3800	03/06/2012
132,525	6.3767	03/06/2012
117,800	6.3663	03/06/2012
44,175	6.4000	03/07/2012
14,725	6.4113	03/07/2012
2,003	6.4199	03/08/2012
14,725	6.4700	03/08/2012
103,075	6.8214	03/09/2012
12,722	6.8097	03/09/2012
9,550	6.7604	03/12/2012
19,900	6.9843	03/13/2012
88,350	7.0079	03/14/2012
128,986	6.7662	04/09/2012
353,031	6.7159	04/10/2012
135,092	6.8626	04/11/2012
60,742	7.0772	04/12/2012
305,858	6.8639	04/13/2012
183,300	6.7552	04/16/2012
146,640	6.8478	04/18/2012

CUSIP NO. 458118106

STARBOARD VALUE AND OPPORTUNITY S LLC

29,092	6.7323	02/09/2012
33,200	6.6572	02/10/2012
8,300	6.6972	02/13/2012
8,300	6.7562	02/13/2012
10,724	6.7262	02/13/2012
5,876	6.6770	02/14/2012
16,600	6.8133	02/15/2012
32,523	6.8114	02/15/2012
8,977	6.8931	02/16/2012
8,300	7.0159	02/16/2012
14,940	6.7931	02/22/2012
47,310	6.7831	02/22/2012
15,566	6.7800	02/23/2012
17,634	6.7548	02/24/2012
8,300	6.6865	02/27/2012
28,220	6.6865	02/27/2012
29,880	6.7185	02/27/2012
87,150	6.8638	02/28/2012
4,150	6.8108	02/28/2012
182,600	6.9514	02/29/2012
20,750	6.9500	02/29/2012
116,200	6.9522	02/29/2012
12,450	6.9233	02/29/2012
8,050	6.8800	03/01/2012
64,777	6.8656	03/01/2012
23,715	6.7600	03/02/2012
64,458	6.6306	03/02/2012
8,050	6.5700	03/02/2012
4,508	6.3800	03/05/2012
35,742	6.4250	03/05/2012
12,075	6.3800	03/06/2012
36,225	6.3767	03/06/2012
32,200	6.3663	03/06/2012
12,075	6.4000	03/07/2012
4,025	6.4113	03/07/2012
547	6.4199	03/08/2012
4,025	6.4700	03/08/2012
28,175	6.8214	03/09/2012
3,478	6.8097	03/09/2012
2,611	6.7604	03/12/2012
5,439	6.9843	03/13/2012
24,150	7.0079	03/14/2012
31,877	6.7662	04/09/2012
87,247	6.7159	04/10/2012
33,386	6.8626	04/11/2012
15,011	7.0772	04/12/2012
75,588	6.8639	04/13/2012
45,300	6.7552	04/16/2012
36,240	6.8478	04/18/2012

CUSIP NO. 458118106

STARBOARD VALUE LP

(Through the Starboard Value LP Account)

45,916	6.7323	02/09/2012
52,400	6.6572	02/10/2012
13,100	6.6972	02/13/2012
13,100	6.7562	02/13/2012
16,925	6.7262	02/13/2012
9,275	6.6770	02/14/2012
26,200	6.8133	02/15/2012
51,331	6.8114	02/15/2012
14,169	6.8931	02/16/2012
13,100	7.0159	02/16/2012
23,580	6.7931	02/22/2012
74,670	6.7831	02/22/2012
24,568	6.7800	02/23/2012
27,832	6.7548	02/24/2012
13,100	6.6865	02/27/2012
44,540	6.6865	02/27/2012
47,160	6.7185	02/27/2012
137,550	6.8638	02/28/2012
6,550	6.8108	02/28/2012
288,200	6.9514	02/29/2012
32,750	6.9500	02/29/2012
183,400	6.9522	02/29/2012
19,650	6.9233	02/29/2012
12,500	6.8800	03/01/2012
100,586	6.8656	03/01/2012
36,825	6.7600	03/02/2012
100,089	6.6306	03/02/2012
12,500	6.5700	03/02/2012
7,000	6.3800	03/05/2012
55,500	6.4250	03/05/2012
18,750	6.3800	03/06/2012
56,250	6.3767	03/06/2012
50,000	6.3663	03/06/2012
18,750	6.4000	03/07/2012
6,250	6.4113	03/07/2012
850	6.4199	03/08/2012
6,250	6.4700	03/08/2012
43,750	6.8214	03/09/2012
5,400	6.8097	03/09/2012
4,054	6.7604	03/12/2012
8,446	6.9843	03/13/2012
37,500	7.0079	03/14/2012
50,244	6.7662	04/09/2012
137,515	6.7159	04/10/2012
52,622	6.8626	04/11/2012
23,661	7.0772	04/12/2012
119,140	6.8639	04/13/2012
71,400	6.7552	04/16/2012
57,120	6.8478	04/18/2012