Inventory (detail) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
Inventory Disclosure [Abstract]
Inventory, LIFO Reserve	$ 143,650,000	$ 162,480,000	$ 143,650,000	$ 162,480,000
Inventory, LIFO Reserve, Period Charge	$ 2,476,000	$ 50,000	$ 4,375,000	$ 1,587,000