Additional stock repurchase program authorized amount.

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- Definition

Common stock for future issuance number increase.

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Common stock for future issuance percentage increased.

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- Definition

A description of the time periods when employees can make stock purchases at a discounted rate.

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No definition available.

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Employees contribution on earnings.

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- Definition

Number of Tranches

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No definition available.

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- Definition

Percentage of shares vested under performance target.

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No definition available.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options granted in period fair value.

+ References

No definition available.

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- Definition

Shares reserved for future issuance expressed as a percentage of outstanding shares.

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No definition available.

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- Definition

Percentage ownership by stockholders.

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No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
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-Subparagraph (h)(1)(i)
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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Aggregate number of common shares reserved for future issuance.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

+ References

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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No definition available.

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Unrecognized cost of unvested options awarded to employees as compensation.

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No definition available.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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No definition available.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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-Paragraph 1
-Subparagraph (a)
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Discount rate from fair value on offering date that participants pay for shares.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Discount rate from fair value on purchase date that participants pay for shares.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ References

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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- Definition

Percentage of vesting of share-based compensation awards.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

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Per share or per unit amount of equity securities issued.

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No definition available.

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Number of shares issued during the period as a result of an employee stock purchase plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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Amount of stock repurchase plan authorized.

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No definition available.

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Amount remaining of a stock repurchase plan authorized.

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No definition available.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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-Name Regulation S-X (SX)
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-Article 5

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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Stockholders' Equity - Additional Information (Details)			1 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
Stockholders' Equity - Additional Information (Details)	Jan. 01, 2016 shares	Mar. 26, 2014 shares	Mar. 31, 2015 tranche	Sep. 30, 2016 USD ($) $ / shares shares	Sep. 30, 2015 USD ($) $ / shares	Jun. 30, 2016	Sep. 30, 2016 USD ($) $ / shares shares	Sep. 30, 2015 USD ($) $ / shares	Dec. 31, 2015 USD ($)	Feb. 29, 2016 USD ($)	Jun. 30, 2015 USD ($)	Nov. 30, 2014 USD ($)	May 31, 2014 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan description							Options issued to recipients other than nonemployee directors generally vest over four years with a one year cliff and monthly thereafter, and have a maximum contractual term of 10 years.
Grants in period \| shares							0
Weighted-average grant-date fair value of stock options granted \| $ / shares					$ 8.09			$ 12.85
Total fair value of options vested				$ 1,600,000	$ 1,800,000		$ 5,300,000	$ 7,500,000
Total intrinsic value of options exercised				5,700,000	7,300,000		13,900,000	50,300,000
Cash received from options exercised							3,600,000	6,500,000
Unrecognized compensation expense of options, net of forfeitures				7,200,000			$ 7,200,000
Unrecognized compensation expense, expected to be recognized over a weighted-average period							1 year 6 months 22 days
Employee stock purchase plans, purchased shares \| shares							147,354
Additional stock repurchase program authorized amount										$ 50,000,000	$ 50,000,000	$ 30,000,000
Stock repurchased during period, value							$ 43,700,000		$ 48,400,000
Stock repurchased during period, shares \| shares							2,150,210
Stock repurchase remained available for future repurchase, value				37,900,000			$ 37,900,000
Stock-based compensation expense				$ 6,264,000	4,188,000		20,169,000	12,991,000
Income tax benefit recognized relating to stock-based compensation expense							7,100,000	4,200,000
Actual tax benefit realized from stock options exercised							4,100,000	16,400,000
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting percentage				25.00%
Term of stock options						4 years
Stock Option \| Vesting in one year for non-employee director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting percentage									33.00%
Stock Option \| Awards vesting a year from grant date for newly hired employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting percentage				25.00%
Stock Option \| Remaining awards vesting during each month
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of stock options						3 years
Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense of options, net of forfeitures				$ 45,300,000			$ 45,300,000
Unrecognized compensation expense, expected to be recognized over a weighted-average period							2 years 10 months 23 days
Total grant date fair value of restricted stock units granted				3,800,000	3,000,000		$ 39,700,000	27,900,000
Total grant date fair value of restricted stock units				$ 3,700,000	$ 1,200,000		$ 12,300,000	$ 2,300,000
Restricted Stock Unit \| Awards vesting a year from grant date for newly hired employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting percentage				25.00%
Restricted Stock Unit \| Awards vesting during each quarter after first year for newly hired employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting percentage							6.25%
Restricted Stock Unit \| Remaining awards vesting during each quarter
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting percentage							6.25%
Performance-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of stock options			3 years
Number of tranches \| tranche			3
Unrecognized compensation expense, expected to be recognized over a weighted-average period							1 year 3 months
Unrecognized compensation expense of awards other than options, net of forfeitures				$ 500,000			$ 500,000
Performance-based restricted stock units \| Share-based compensation award, tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period			12 months				12 months
Performance-based restricted stock units \| Share-based compensation award, tranche two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period			24 months				24 months
Performance-based restricted stock units \| Share-based compensation award, tranche three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period			36 months				36 months
Minimum \| Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ownership, greater than 10%									10.00%
Minimum \| Performance-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting percentage range			150.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount													$ 15,000,000
Maximum \| Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term									5 years
Maximum \| Performance-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting percentage range			200.00%
Nonemployee directors \| Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted percentage of fair market value							110.00%
Nonemployee directors \| Maximum \| Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term							10 years
2000 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional number of shares available for grant \| shares				0			0
2009 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance expressed as a percentage of outstanding shares							4.50%
Number of shares reserved for issuance \| shares	3,166,714
2009 Plan \| Nonemployee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan description							The 2009 Plan, as amended, provides that the number of shares reserved for issuance under the 2009 Plan will increase on January 1 of each year for a period of up to five years by 4.5% of the total number of shares of capital stock outstanding on December 31 of the preceding calendar year, which will begin on January 1, 2015 and continue through January 1, 2019.
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance \| shares		1,100,000.0
Common stock for future issuance percentage increased		1.00%
Authorized shares reserved for issuance \| shares	703,714
Stock options granted percentage of fair market value on offering date		85.00%
Stock options granted percentage of fair market value on purchase date		85.00%
Employee stock purchase plan offering periods							Offering periods are six months in duration and will end on or about May 15 and November 15 of each year.
Share price \| $ / shares				$ 15.64			$ 15.64
Employee stock purchase plans, purchased share values							$ 2,300,000
Employee Stock Purchase Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employees contribution on earnings		1.00%
Employee Stock Purchase Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock for future issuance number increase \| shares		1,800,000
Employees contribution on earnings		15.00%