RELATED PARTY INFORMATION - WAKEFERN (Details) - Wakefern - USD ($)		12 Months Ended
	Feb. 15, 2014	Jul. 25, 2015	Jul. 26, 2014	Jul. 27, 2013
Related Party Transaction [Line Items]
Ownership interest in Wakefern		13.40%
Purchase obligation, as a percentage of merchandise requirements		85.00%
Purchase obligation period		10 years
Percentage of stockholders to request termination		75.00%
Indebtedness to Wakefern		$ 1,156,000
Installment payments year one		430,000
Installment payments year two		344,000
Installment payments year three		287,000
Installment payments year four		95,000
Installment payments after year four		0
Maximum per store investment		875,000
Per store investment increase		25,000	$ 25,000
Additional investment		738,000	657,000
Vendor allowances and rebates		27,557,000	26,438,000	$ 24,779,000
Support services incurred charges		33,306,000	32,808,000	29,973,000
Demand deposits invested at related party Wakefern		35,428,000	52,891,000
Interest income earned on investments related entity		$ 2,399,000	$ 2,622,000	$ 2,783,000
Matured Notes Receivable from Wakefern
Related Party Transaction [Line Items]
Related party interest rate	7.00%
Reinvested Notes Receivable from Wakefern
Related Party Transaction [Line Items]
Note receivable related party	$ 40,000,000
Related Party Note Receivable Maturing August 2017
Related Party Transaction [Line Items]
Related Party Transaction, Basis Spread on Variable Rate	0.25%
Percent of notes receivable	50.00%
Related Party Note Receivable Maturing February 2019
Related Party Transaction [Line Items]
Related Party Transaction, Basis Spread on Variable Rate	1.25%
Percent of notes receivable	50.00%
Prepayment of Notes Receivable
Related Party Transaction [Line Items]
Related party transaction amount	$ 23,420,000
Insure-Rite Ltd.
Related Party Transaction [Line Items]
Investment in Insure-Rite, Ltd		8.20%