Inventory (detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011
Inventory Disclosure [Abstract]
Inventory, LIFO Reserve	$ 136,100,000	$ 119,900,000	$ 136,100,000	$ 119,900,000
Inventory, LIFO Reserve, Period Charge	$ 1,268,000	$ 10,774,000	$ 1,176,000	$ 30,055,000