Inventory (detail) (USD $)	3 Months Ended		6 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
InvInventory Disclosure [Abstract]
Inventory, LIFO Reserve	$ 134,800,000	$ 109,200,000	$ 134,800,000	$ 109,200,000
Inventory, LIFO Reserve, Period Charge	$ 3,706,000	$ 12,754,000	$ 2,444,000	$ 19,281,000