Supplemental Consolidating Financial Statements - Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 25, 2014	Oct. 26, 2013
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 10,905	$ (18,693)
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	(8,371)	0
Capital expenditures	(18,028)	(30,288)
Proceeds from sale of assets	1,698	2,465
Capital Contribution To Subsidiaries	0
Investment in subsidiaries	0
Changes in restricted cash	(541)	(305)
Net cash used in investing activities	(25,242)	(28,128)
Cash flows from financing activities:
Borrowings on senior Credit Agreement	132,000	164,000
Principal payments on Senior Credit Agreement	(122,344)	(131,563)
Exercise of stock options and other	567	10,124
Restricted stock tax withholdings	(309)	(609)
Excess tax benefit from share-based awards	210	656
Intercompany funding	0	0
Net cash provided by financing activities	10,124	42,608
Net (decrease) increase in cash and equivalents	(4,213)	(4,213)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	20,672	18,607
CASH AND EQUIVALENTS AT END OF PERIOD	16,459	14,394
Parent
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	(5,233)	(2,905)
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	0
Capital expenditures	(1,597)	(1,680)
Proceeds from sale of assets	0	0
Capital Contribution To Subsidiaries	0
Investment in subsidiaries	0
Changes in restricted cash	(541)	(305)
Net cash used in investing activities	(2,138)	(1,985)
Cash flows from financing activities:
Borrowings on senior Credit Agreement	132,000	164,000
Principal payments on Senior Credit Agreement	(122,344)	(131,563)
Exercise of stock options and other	567	10,124
Restricted stock tax withholdings	(309)	(609)
Excess tax benefit from share-based awards	210	656
Intercompany funding	(2,753)	(37,718)
Net cash provided by financing activities	7,371	4,890
Net (decrease) increase in cash and equivalents	0	0
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	0	0
CASH AND EQUIVALENTS AT END OF PERIOD	0	0
Issuer
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	1,924	1,835
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	0
Capital expenditures	0	0
Proceeds from sale of assets	0	0
Capital Contribution To Subsidiaries	891
Investment in subsidiaries	(2,125)
Changes in restricted cash	0	0
Net cash used in investing activities	(1,234)	0
Cash flows from financing activities:
Borrowings on senior Credit Agreement	0	0
Principal payments on Senior Credit Agreement	0	0
Exercise of stock options and other	0	0
Restricted stock tax withholdings	0	0
Excess tax benefit from share-based awards	0	0
Intercompany funding	(690)	(1,835)
Net cash provided by financing activities	(690)	(1,835)
Net (decrease) increase in cash and equivalents	0	0
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	0	0
CASH AND EQUIVALENTS AT END OF PERIOD	0	0
Subsidiary Guarantors
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	14,666	(17,351)
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	(8,371)
Capital expenditures	(14,861)	(27,042)
Proceeds from sale of assets	1,698	2,422
Capital Contribution To Subsidiaries	0
Investment in subsidiaries	(200)
Changes in restricted cash	0	0
Net cash used in investing activities	(21,734)	(24,620)
Cash flows from financing activities:
Borrowings on senior Credit Agreement	0	0
Principal payments on Senior Credit Agreement	0	0
Exercise of stock options and other	0	0
Restricted stock tax withholdings	0	0
Excess tax benefit from share-based awards	0	0
Intercompany funding	3,130	37,436
Net cash provided by financing activities	3,130	37,436
Net (decrease) increase in cash and equivalents	(3,938)	(4,535)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	19,739	18,166
CASH AND EQUIVALENTS AT END OF PERIOD	15,801	13,631
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	(452)	(272)
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	0
Capital expenditures	(1,570)	(1,566)
Proceeds from sale of assets	0	43
Capital Contribution To Subsidiaries	0
Investment in subsidiaries	0
Changes in restricted cash	0	0
Net cash used in investing activities	(1,570)	(1,523)
Cash flows from financing activities:
Borrowings on senior Credit Agreement	0	0
Principal payments on Senior Credit Agreement	0	0
Exercise of stock options and other	0	0
Restricted stock tax withholdings	0	0
Excess tax benefit from share-based awards	0	0
Intercompany funding	1,747	2,117
Net cash provided by financing activities	1,747	2,117
Net (decrease) increase in cash and equivalents	(275)	322
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	933	441
CASH AND EQUIVALENTS AT END OF PERIOD	658	763
Eliminations and Reclassifications
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	0	0
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	0
Capital expenditures	0	0
Proceeds from sale of assets	0	0
Capital Contribution To Subsidiaries	(891)
Investment in subsidiaries	2,325
Changes in restricted cash	0	0
Net cash used in investing activities	1,434	0
Cash flows from financing activities:
Borrowings on senior Credit Agreement	0	0
Principal payments on Senior Credit Agreement	0	0
Exercise of stock options and other	0	0
Restricted stock tax withholdings	0	0
Excess tax benefit from share-based awards	0	0
Intercompany funding	(1,434)	0
Net cash provided by financing activities	(1,434)	0
Net (decrease) increase in cash and equivalents	0	0
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	0	0
CASH AND EQUIVALENTS AT END OF PERIOD	$ 0	$ 0