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Debt - Senior Subordinated Notes - Loss on Debt Extinguishment (Details) - USD ($)			3 Months Ended	12 Months Ended
	Oct. 15, 2015	Sep. 15, 2015	Oct. 24, 2015	Jul. 29, 2017	Jul. 30, 2016	Jul. 25, 2015	Jul. 15, 2015
Debt Instrument [Line Items]
Loss on debt extinguishment				$ 0	$ (16,260,000)	$ 0
Write-off of deferred financing fees and premium on long-term debt				$ 0	$ 2,017,000	$ 0
7.125% Senior Subordinated Notes Due 2021
Debt Instrument [Line Items]
Debt instrument, face amount							$ 277,500,000.0
Debt, interest rate (in percent)			7.125%	7.125%			7.125%
Repayments of debt		$ 296,600,000
Debt Instrument, Increase, Accrued Interest	$ 4,900,000
Redemption Premium	$ 14,200,000
Debt Instrument, Redemption Price, Percentage	103.563%
Loss on debt extinguishment			$ 16,300,000
Gains (Losses) on Extinguishment of Debt, before Write off of Deferred Debt Issuance Cost	$ 6,500,000
Write-off of deferred financing fees and premium on long-term debt	$ 4,900,000

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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Increase for accrued, but unpaid interest on the debt instrument for the period.

+ References

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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-Publisher FASB
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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Reflects the difference between the fair value of payments made to legally extinguish a debt and its carrying value at that time. This item excludes the write-off of amounts previously capitalized as debt issuance costs.

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The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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