Debt Instruments (detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011
Debt Instruments [Abstract]
Line of Credit Facility, Amount Outstanding	$ 185,860,000	$ 206,346,000	$ 185,860,000	$ 206,346,000
Debt, Weighted Average Interest Rate	1.48%	1.89%	1.48%	1.89%
Line of Credit Facility, Maximum Amount Outstanding During Period	258,000,000	268,363,000	258,000,000	268,363,000
Line of Credit Facility, Average Outstanding Amount	188,302,000	215,397,000	150,773,000	163,772,000
Debt Instrument, Interest Rate During Period	1.47%	1.78%	1.51%	1.61%
August through March [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	350,000,000		350,000,000
April through July [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 250,000,000		$ 250,000,000