Supplemental Consolidating Financial Statements (Details) - USD ($) $ in Thousands	Jul. 25, 2015	Jul. 26, 2014
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 525,591	$ 457,801
7.125% Senior Subordinated Notes Due 2021
Debt Instrument [Line Items]
Debt and capital lease obligations	280,300	280,700
7.125% Senior Subordinated Notes Due 2021 \| Senior Subordinated Notes
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 277,500	$ 277,500

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13,16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Name:	us-gaap_DebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant