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Debt - Components of the Convertible Notes (Details) - USD ($)		12 Months Ended
	Sep. 15, 2015	Jul. 29, 2017	Jul. 30, 2016	Jul. 25, 2015
Debt Instrument [Line Items]
Equity component of 0.75% senior convertible notes due 2021, net		$ 112,600,000
Debt issuance costs		70,000	$ 16,376,000	$ 3,854,000
Amortization of debt issuance costs and other		17,610,000	14,709,000	$ 0
0.75% Convertible Notes Liability Component [Member]
Debt Instrument [Line Items]
Debt issuance cost	$ (11,500,000)
0.75% Convertible Notes Equity Component [Member]
Debt Instrument [Line Items]
Debt issuance cost	(3,600,000)
0.75% Convertible Senior Notes Due 2021
Debt Instrument [Line Items]
Debt instrument, face amount	485,000,000	485,000,000	485,000,000
Debt Instrument, Unamortized Discount		(84,069,000)	(101,679,000)
Debt issuance cost	(15,100,000)	(8,698,000)	(10,244,000)
Net carrying amount of Notes		392,233,000	373,077,000
Debt Instrument, Unamortized Discount (Premium), Net	13,300,000
Debt issuance costs	$ 1,800,000
Amortization of debt issuance costs and other		$ 17,600,000	$ 14,700,000

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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

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