Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands		Oct. 30, 2015	Jul. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	[1]	$ 53,084	$ 191,084
Interest rate swap asset (see Note 5)		1,038	3,759
Deferred compensation plan assets	[2]	26,892	26,947
Total assets at fair value		81,014	221,790
Interest rate swap liability (see Note 5)		11,982	9,821
Total liabilities at fair value		11,982	9,821
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	[1]	53,084	191,084
Interest rate swap asset (see Note 5)		0	0
Deferred compensation plan assets	[2]	26,892	26,947
Total assets at fair value		79,976	218,031
Interest rate swap liability (see Note 5)		0	0
Total liabilities at fair value		0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	[1]	0	0
Interest rate swap asset (see Note 5)		1,038	3,759
Deferred compensation plan assets	[2]	0	0
Total assets at fair value		1,038	3,759
Interest rate swap liability (see Note 5)		11,982	9,821
Total liabilities at fair value		11,982	9,821
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	[1]	0	0
Interest rate swap asset (see Note 5)		0	0
Deferred compensation plan assets	[2]	0	0
Total assets at fair value		0	0
Interest rate swap liability (see Note 5)		0	0
Total liabilities at fair value		$ 0	$ 0

[1] Consists of money market fund investments.

[2] Represents plan assets invested in mutual funds established under a rabbi trust for the Company's non-qualified savings plan and is included in the Consolidated Balance Sheets as other assets.