Supplemental Consolidating Financial Statements Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jan. 26, 2013	Jan. 28, 2012	Jul. 28, 2012	Jul. 30, 2011
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 91,241	$ 70,851
INVESTING ACTIVITIES:
Capital expenditures	(29,029)	(43,438)
Proceeds from sale of assets	2,845	8,942
Cash paid for acquisition, net of cash acquired	(314,771)	0
Changes in Restricted Cash	(31)	550
Capital Contribution To Subsidiaries	0	0
Net cash used in investing activities	(340,986)	(33,946)
Proceeds from Long-term Lines of Credit	180,500	0
Proceeds from Issuance of Senior Long-term Debt	125,000	0
Proceeds from Issuance of Senior Subordinated Debt	93,825	0
Principal payments on Senior Credit Agreement	160,500	0
Debt Issuance Cost	(6,409)
FINANCING ACTIVITIES:
Repayments of Long-term Capital Lease Obligations	(74)	(140)
Repurchases of common stock	(15,203)	0	(12,960)	(64,548)
Exercise of stock options and other	2,890	4,013
Restricted stock tax withholdings	(885)	(328)
Excess tax benefit from share-based awards	610	979
Intercompany funding	0	0
Net cash provided by financing activities	219,754	4,524
Net increase in cash and equivalents	(29,991)	41,429
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	52,581	44,766
CASH AND EQUIVALENTS AT END OF PERIOD	22,590	86,195	52,581	44,766
Parent
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	(832)	(1,992)
INVESTING ACTIVITIES:
Capital expenditures	(4,508)	(1,723)
Proceeds from sale of assets	0	0
Cash paid for acquisition, net of cash acquired	0
Changes in Restricted Cash	(31)	550
Capital Contribution To Subsidiaries	0	0
Net cash used in investing activities	(4,539)	(1,173)
Proceeds from Long-term Lines of Credit	180,500
Proceeds from Issuance of Senior Long-term Debt	125,000
Proceeds from Issuance of Senior Subordinated Debt	0
Principal payments on Senior Credit Agreement	160,500
Debt Issuance Cost	(4,128)
FINANCING ACTIVITIES:
Repayments of Long-term Capital Lease Obligations	0	0
Repurchases of common stock	(15,203)
Exercise of stock options and other	2,890	4,013
Restricted stock tax withholdings	(885)	(328)
Excess tax benefit from share-based awards	610	979
Intercompany funding	(122,913)	(1,499)
Net cash provided by financing activities	5,371	3,165
Net 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	(4,200)	(4,490)
INVESTING ACTIVITIES:
Capital expenditures	0	0
Proceeds from sale of assets		0
Cash paid for acquisition, net of cash acquired	0
Changes in Restricted Cash	0	0
Capital Contribution To Subsidiaries	1,816	6,501
Net cash used in investing activities	1,816	6,501
Proceeds from Long-term Lines of Credit	0
Proceeds from Issuance of Senior Long-term Debt	0
Proceeds from Issuance of Senior Subordinated Debt	93,825
Principal payments on Senior Credit Agreement	0
Debt Issuance Cost	(2,281)
FINANCING ACTIVITIES:
Repayments of Long-term Capital Lease Obligations	0	0
Repurchases of common stock	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	(89,160)	(2,011)
Net cash provided by financing activities	2,384	(2,011)
Net 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	96,059	78,123
INVESTING ACTIVITIES:
Capital expenditures	(22,275)	(39,406)
Proceeds from sale of assets	2,798	8,908
Cash paid for acquisition, net of cash acquired	(314,771)
Changes in Restricted Cash	0	0
Capital Contribution To Subsidiaries	0	0
Net cash used in investing activities	(334,248)	(30,498)
Proceeds from Long-term Lines of Credit	0
Proceeds from Issuance of Senior Long-term Debt	0
Proceeds from Issuance of Senior Subordinated Debt	0
Principal payments on Senior Credit Agreement	0
Debt Issuance Cost	0
FINANCING ACTIVITIES:
Repayments of Long-term Capital Lease Obligations	(74)	(140)
Repurchases of common stock	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	208,228	(6,780)
Net cash provided by financing activities	208,154	(6,920)
Net increase in cash and equivalents	(30,035)	40,705
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	51,563	44,608
CASH AND EQUIVALENTS AT END OF PERIOD	21,528	85,313
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	214	(790)
INVESTING ACTIVITIES:
Capital expenditures	(2,246)	(2,309)
Proceeds from sale of assets	47	34
Cash paid for acquisition, net of cash acquired	0
Changes in Restricted Cash	0	0
Capital Contribution To Subsidiaries	0	0
Net cash used in investing activities	(2,199)	(2,275)
Proceeds from Long-term Lines of Credit	0
Proceeds from Issuance of Senior Long-term Debt	0
Proceeds from Issuance of Senior Subordinated Debt	0
Principal payments on Senior Credit Agreement	0
Debt Issuance Cost	0
FINANCING ACTIVITIES:
Repayments of Long-term Capital Lease Obligations	0	0
Repurchases of common stock	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	2,029	3,789
Net cash provided by financing activities	2,029	3,789
Net increase in cash and equivalents	44	724
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	1,018	158
CASH AND EQUIVALENTS AT END OF PERIOD	1,062	882
Eliminations and Reclassifications
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	0	0
INVESTING ACTIVITIES:
Capital expenditures	0	0
Proceeds from sale of assets	0	0
Cash paid for acquisition, net of cash acquired	0
Changes in Restricted Cash	0	0
Capital Contribution To Subsidiaries	(1,816)	(6,501)
Net cash used in investing activities	(1,816)	(6,501)
Proceeds from Long-term Lines of Credit	0
Proceeds from Issuance of Senior Long-term Debt	0
Proceeds from Issuance of Senior Subordinated Debt	0
Principal payments on Senior Credit Agreement	0
Debt Issuance Cost	0
FINANCING ACTIVITIES:
Repayments of Long-term Capital Lease Obligations	0	0
Repurchases of common stock	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	1,816	6,501
Net cash provided by financing activities	1,816	6,501
Net increase in cash and equivalents	0	0
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	0
CASH AND EQUIVALENTS AT END OF PERIOD	$ 0	$ 0