Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands		Jan. 27, 2017	Jul. 29, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	[1]	$ 110,120	$ 76,084
Interest rate swap asset (see Note 5)		1,790	0
Deferred compensation plan assets	[2]	28,780	27,764
Total assets at fair value		140,690	103,848
Interest rate swap liability (see Note 5)		6,540	22,250
Total liabilities at fair value		6,540	22,250
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]	110,120	76,084
Interest rate swap asset (see Note 5)		0	0
Deferred compensation plan assets	[2]	28,780	27,764
Total assets at fair value		138,900	103,848
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)		1,790	0
Deferred compensation plan assets	[2]	0	0
Total assets at fair value		1,790	0
Interest rate swap liability (see Note 5)		6,540	22,250
Total liabilities at fair value		6,540	22,250
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 Condensed Consolidated Balance Sheets as other assets.