Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands		Jul. 31, 2015	Aug. 01, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	[1]	$ 191,084	$ 63,068
Interest rate swap asset (see Note 6)		3,759	240
Deferred compensation plan assets	[2]	26,947	25,322
Total assets at fair value		221,790	88,630
Interest rate swap liability (see Note 6)		9,821	7,943
Total liabilities at fair value		9,821	7,943
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]	191,084	63,068
Interest rate swap asset (see Note 6)		0	0
Deferred compensation plan assets	[2]	26,947	25,322
Total assets at fair value		218,031	88,390
Interest rate swap liability (see Note 6)		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 6)		3,759	240
Deferred compensation plan assets	[2]	0	0
Total assets at fair value		3,759	240
Interest rate swap liability (see Note 6)		9,821	7,943
Total liabilities at fair value		9,821	7,943
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 6)		0	0
Deferred compensation plan assets	[2]	0	0
Total assets at fair value		0	0
Interest rate swap liability (see Note 6)		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 (see Note 12).