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Debt - Components of the Convertible Notes (Details) - USD ($)	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016	Jul. 29, 2017	Sep. 15, 2015
Debt Instrument [Line Items]
Equity component of 0.75% senior convertible notes due 2021, net	$ 112,600,000
Amortization of debt discount	4,547,000	$ 4,307,000
0.75% Convertible Senior Notes Due 2021
Debt Instrument [Line Items]
Debt instrument, face amount	485,000,000		$ 485,000,000	$ 485,000,000.0
Debt Instrument, Unamortized Discount	(79,522,000)		(84,069,000)
Debt issuance cost	(8,282,000)		(8,698,000)
Net carrying amount of Notes	397,196,000		$ 392,233,000
Amortization of debt discount	$ 4,500,000	$ 4,300,000

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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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Amount, after accumulated amortization, of debt discount.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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