Cash and Cash Equivalents and Investments-Textual (Details) (USD $) In Thousands, unless otherwise specified				12 Months Ended
Mar. 31, 2013	Apr. 01, 2012	Mar. 31, 2013 Certificates of deposit [Member]	Mar. 31, 2013 Level 2 [Member] Certificates of deposit [Member]
Cash and Cash Equivalents and Investments (Additional Textual) [Abstract]
Maturities period of certificates of deposit minimum				3 months
Maturities period of certificates of deposit maximum				2 years
Current asset fair value	$ 15,625	$ 12,210	$ 15,600
Noncurrent asset fair value	$ 5,597	$ 5,139	$ 5,600

Amount of available-for-sale debt securities at fair value maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 320

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 20

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant