Supplemental Consolidating Financial Statements - Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jan. 24, 2015	Jan. 25, 2014	Jul. 26, 2014
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 83,255	$ 67,866
INVESTING ACTIVITIES:
Cash paid for acquisitions, net of cash acquired	(9,821)	0
Capital expenditures	(38,772)	(49,240)
Proceeds from sale of assets	4,039	4,964
Return of capital from subsidiaries	0	0
Investment in subsidiaries	0	0
Changes in restricted cash	(541)	(305)
Net cash used in investing activities	(45,095)	(44,581)
FINANCING ACTIVITIES:
Proceeds from borrowings on senior Credit Agreement	175,000	221,000
Principal payments on senior Credit Agreement, including Term Loan	(198,688)	(247,125)
Repurchases of common stock	(17,147)	(9,999)	(10,000)
Exercise of stock options	2,335	11,869
Restricted stock tax withholdings	(4,330)	(3,590)
Excess tax benefit from share-based awards	2,426	2,297
Intercompany funding	0	0
Net cash used in financing activities	(40,404)	(25,548)
Net decrease in cash and equivalents	(2,244)	(2,263)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	20,672	18,607	18,607
CASH AND EQUIVALENTS AT END OF PERIOD	18,428	16,344	20,672
Parent
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(8,331)	(4,085)
INVESTING ACTIVITIES:
Cash paid for acquisitions, net of cash acquired	0
Capital expenditures	(4,144)	(3,351)
Proceeds from sale of assets	0	0
Return of capital from subsidiaries	0	0
Investment in subsidiaries	0	0
Changes in restricted cash	(541)	(305)
Net cash used in investing activities	(4,685)	(3,656)
FINANCING ACTIVITIES:
Proceeds from borrowings on senior Credit Agreement	175,000	221,000
Principal payments on senior Credit Agreement, including Term Loan	(198,688)	(247,125)
Repurchases of common stock	(17,147)	(9,999)
Exercise of stock options	2,335	11,869
Restricted stock tax withholdings	(4,330)	(3,590)
Excess tax benefit from share-based awards	2,426	2,297
Intercompany funding	53,420	33,289
Net cash used in financing activities	13,016	7,741
Net decrease in cash and equivalents	0	0
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	0	0	0
CASH AND EQUIVALENTS AT END OF PERIOD	0	0
Issuer
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(6,115)	(6,135)
INVESTING ACTIVITIES:
Cash paid for acquisitions, net of cash acquired	0
Capital expenditures	0	0
Proceeds from sale of assets	0	0
Return of capital from subsidiaries	1,749	683
Investment in subsidiaries	(21,668)	(800)
Changes in restricted cash	0	0
Net cash used in investing activities	(19,919)	(117)
FINANCING ACTIVITIES:
Proceeds from borrowings on senior Credit Agreement	0	0
Principal payments on senior Credit Agreement, including Term Loan	0	0
Repurchases of common stock	0	0
Exercise of stock options	0	0
Restricted stock tax withholdings	0	0
Excess tax benefit from share-based awards	0	0
Intercompany funding	26,034	6,252
Net cash used in financing activities	26,034	6,252
Net decrease in cash and equivalents	0	0
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	0	0	0
CASH AND EQUIVALENTS AT END OF PERIOD	0	0
Subsidiary Guarantors
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	96,931	79,911
INVESTING ACTIVITIES:
Cash paid for acquisitions, net of cash acquired	(9,821)
Capital expenditures	(31,281)	(43,150)
Proceeds from sale of assets	4,031	3,361
Return of capital from subsidiaries	0	0
Investment in subsidiaries	(300)	0
Changes in restricted cash	0	0
Net cash used in investing activities	(37,371)	(39,789)
FINANCING ACTIVITIES:
Proceeds from borrowings on senior Credit Agreement	0	0
Principal payments on senior Credit Agreement, including Term Loan	0	0
Repurchases of common stock	0	0
Exercise of stock options	0	0
Restricted stock tax withholdings	0	0
Excess tax benefit from share-based awards	0	0
Intercompany funding	(62,219)	(43,076)
Net cash used in financing activities	(62,219)	(43,076)
Net decrease in cash and equivalents	(2,659)	(2,954)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	19,739	18,166	18,166
CASH AND EQUIVALENTS AT END OF PERIOD	17,080	15,212
Non- Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	770	(1,825)
INVESTING ACTIVITIES:
Cash paid for acquisitions, net of cash acquired	0
Capital expenditures	(3,347)	(2,739)
Proceeds from sale of assets	8	1,603
Return of capital from subsidiaries	0	0
Investment in subsidiaries	0	0
Changes in restricted cash	0	0
Net cash used in investing activities	(3,339)	(1,136)
FINANCING ACTIVITIES:
Proceeds from borrowings on senior Credit Agreement	0	0
Principal payments on senior Credit Agreement, including Term Loan	0	0
Repurchases of common stock	0	0
Exercise of stock options	0	0
Restricted stock tax withholdings	0	0
Excess tax benefit from share-based awards	0	0
Intercompany funding	2,984	3,652
Net cash used in financing activities	2,984	3,652
Net decrease in cash and equivalents	415	691
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	933	441	441
CASH AND EQUIVALENTS AT END OF PERIOD	1,348	1,132
Eliminations and Reclassifications
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	0	0
INVESTING ACTIVITIES:
Cash paid for acquisitions, net of cash acquired	0
Capital expenditures	0	0
Proceeds from sale of assets	0	0
Return of capital from subsidiaries	(1,749)	(683)
Investment in subsidiaries	21,968	800
Changes in restricted cash	0	0
Net cash used in investing activities	20,219	117
FINANCING ACTIVITIES:
Proceeds from borrowings on senior Credit Agreement	0	0
Principal payments on senior Credit Agreement, including Term Loan	0	0
Repurchases of common stock	0	0
Exercise of stock options	0	0
Restricted stock tax withholdings	0	0
Excess tax benefit from share-based awards	0	0
Intercompany funding	(20,219)	(117)
Net cash used in financing activities	(20,219)	(117)
Net decrease in cash and equivalents	0	0
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	0	0	0
CASH AND EQUIVALENTS AT END OF PERIOD	$ 0	$ 0