Acquisition (Detail) (USD $)	3 Months Ended						4 Months Ended		12 Months Ended			9 Months Ended	6 Months Ended		12 Months Ended		9 Months Ended			6 Months Ended
	Dec. 29, 2012	Jun. 16, 2012	Mar. 24, 2012	Dec. 31, 2011	Jun. 18, 2011	Mar. 26, 2011	Oct. 06, 2012	Oct. 08, 2011	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011	Dec. 29, 2012 Food Distribution [Member] Acquisition - Bag 'N Save [Member]	Dec. 29, 2012 Food Distribution [Member] Acquisition – No Frills[Member]	Dec. 29, 2012 Accounts Payable Due to the Company from No Frills [Member] Acquisition – No Frills[Member]	Dec. 29, 2012 Selling, General and Administrative Expenses [Member] Acquisition - Bag 'N Save [Member]	Dec. 29, 2012 Selling, General and Administrative Expenses [Member] Acquisition – No Frills[Member]	Dec. 29, 2012 Acquisition - Bag 'N Save [Member]	Apr. 03, 2012 Acquisition - Bag 'N Save [Member]	Dec. 29, 2012 Acquisition – No Frills[Member] Account Receivable Due to No Frills from the Company [Member]	Dec. 29, 2012 Acquisition – No Frills[Member]	Jun. 25, 2012 Acquisition – No Frills[Member]
Business Acquisition, Cost of Acquired Entity, Cash Paid																		$ 29,700,000			$ 49,300,000
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net																		36,339,000			26,413,000
Gain on Purchase of Business									6,639,000
Business Combination, Acquisition Related Costs															500,000	600,000
Revenue, Net	1,135,620,000	1,104,242,000	1,069,845,000	1,147,742,000	1,111,133,000	1,110,271,000	1,511,090,000	1,486,313,000	4,820,797,000	4,855,459,000	5,034,926,000	(58,300,000)	(61,400,000)				103,500,000			111,700,000
Business Acquisition, Purchase Price Allocation, Goodwill Amount																				22,900,000
Business Acquisition, Purchase Price Allocation, Current Assets, Account Receivables																			500,000		1,893,000
Business Acquisition, Purchase Price Allocation, Current Liabilities, Accounts Payable														$ 2,300,000							$ 3,910,000