Inventory (detail) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 31, 2016	Dec. 26, 2015
Inventory Disclosure [Abstract]
Inventory, LIFO Reserve	$ 139,709,000	$ 150,818,000	$ 139,709,000	$ 150,818,000
Inventory, LIFO Reserve, Period Charge	$ 3,941,000	$ 11,662,000	$ 434,000	$ 13,249,000