Debt Instruments (detail) (USD $)	3 Months Ended
	Jun. 30, 2012	Jul. 02, 2011
Debt Instruments [Abstract]
Line of Credit Facility, Amount Outstanding	$ 100,000,000	$ 115,460,000
Debt, Weighted Average Interest Rate	1.49%	1.19%
Line of Credit Facility, Maximum Amount Outstanding During Period	144,328,000	136,021,000
Line of Credit Facility, Average Outstanding Amount	111,481,000	116,980,000
Debt Instrument, Interest Rate During Period	1.58%	1.23%
August through March [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	350,000,000
April through July [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 250,000,000