Inventories (Detail) (USD $)	4 Months Ended		9 Months Ended
	Oct. 06, 2012	Oct. 08, 2011	Oct. 06, 2012	Oct. 08, 2011	Dec. 31, 2011
Inventory, LIFO Reserve	$ 89,400,000		$ 89,400,000		$ 87,300,000
Inventory, LIFO Reserve, Period Charge	$ 1,400,000	$ 7,100,000	$ 2,040,000	$ 9,717,000