Product Warranty (Details) (USD $) In Thousands	6 Months Ended
Sep. 30, 2011	Oct. 01, 2010
Change in the Company's warranty accrual
Balance, beginning of period	$ 12,942	$ 11,208
Change in liability for warranties issued in period	2,922	4,220
Settlements made (in cash or in kind) during the period	(3,472)	(3,086)
Balance, end of period	$ 12,392	$ 12,342
Product Warranty (Textuals) [Abstract]
Maximum warranty periods provided on limited warranty	5 years

Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any Increase or Decrease in the liability for payments related to extended product warranties.

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

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 14

-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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(2))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Name:	us-gaap_StandardProductWarrantyAccrualPayments
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration