Long-Term Obligations and Commitments (Details) - USD ($)		1 Months Ended	12 Months Ended
	Feb. 01, 2016	May 31, 2009	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014	Mar. 12, 2007
Long Term Obligations And Commitments (Textuals)
Cash paid to license technology		$ 20,000,000
Amount payable over next ten fiscal years for agreement to license technology		$ 100,000,000
Operating lease, term		10 years
Present value of license technology agreement		$ 89,000,000
Years lease term can be extended under lease option			10 years
Operating leases, rent expense			$ 36,000,000	$ 59,000,000	$ 54,000,000
Operating leases, sublease revenue			10,000,000	0	$ 0
Other long-term obligations
Total deferred rent			56,000,000	49,000,000
Total license fee payable			26,000,000	34,000,000
Long-term income tax liabilities			54,000,000	45,000,000
Long-term deferred income tax liabilities			7,000,000	50,000,000
Other			20,000,000	13,000,000
Total long-term obligations			163,000,000	191,000,000
Less current portion (included in other current liabilities)			(17,000,000)	(19,000,000)
Long-term obligations due after one year			146,000,000	$ 172,000,000
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation due 2017			29,000,000
Purchase obligation due 2018			25,000,000
Purchase obligation due 2019			7,000,000
Purchase obligation due 2020			0
Purchase obligation due 2021			0
Purchase obligation due thereafter			0
Total purchase obligations			61,000,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating lease commitments due 2017			60,000,000
Operating lease commitments due 2018			58,000,000
Operating lease commitments due 2019			50,000,000
Operating lease commitments due 2020			48,000,000
Operating lease commitments due 2021			46,000,000
Operating lease commitments due thereafter			176,000,000
Total operating lease commitments			438,000,000
Sublease Income, Fiscal Year Maturity [Abstract]
Sublease income in 2017			21,000,000
Sublease income in 2018			21,000,000
Sublease income 2019			17,000,000
Sublease income 2020			16,000,000
Sublease income 2021			12,000,000
Sublease income thereafter			4,000,000
Total sublease income			91,000,000
Operating Leases, Rent Expense, Net [Abstract]
Net operating lease commitments 2017			39,000,000
Net operating lease commitments 2018			37,000,000
Net operating lease commitments 2019			33,000,000
Net operating lease commitments 2020			32,000,000
Net operating lease commitments due 2021			34,000,000
Net operating lease commitments due thereafter			172,000,000
Total net operating lease commitments			347,000,000
February 1, 2016 Credit Agreement
Long Term Obligations And Commitments (Textuals)
Debt instrument, term	5 years
Master credit agreement amount	$ 1,500,000,000.0
February 1, 2016 Credit Agreement | Line of Credit
Long Term Obligations And Commitments (Textuals)
Periodic payment, principal, percent	2.50%
5.75 percent fixed-rate notes due 2017
Long Term Obligations And Commitments (Textuals)
Term loan						$ 500,000,000
Term Loan | February 1, 2016 Credit Agreement | Line of Credit
Long Term Obligations And Commitments (Textuals)
Term loan, increase limit	$ 500,000,000
Term loan amount outstanding			500,000,000
Long-term debt, current maturities			$ 12,000,000
Term loan	$ 500,000,000
Minimum | Base Rate | Term Loan | February 1, 2016 Credit Agreement | Line of Credit
Long Term Obligations And Commitments (Textuals)
Basis spread on variable rate	0.125%
Minimum | Base Rate | Revolving Credit Facility | February 1, 2016 Credit Agreement | Line of Credit
Long Term Obligations And Commitments (Textuals)
Basis spread on variable rate	0.00%
Minimum | London Interbank Offered Rate (LIBOR) | Term Loan | February 1, 2016 Credit Agreement | Line of Credit
Long Term Obligations And Commitments (Textuals)
Basis spread on variable rate	1.125%
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | February 1, 2016 Credit Agreement | Line of Credit
Long Term Obligations And Commitments (Textuals)
Basis spread on variable rate	0.90%
Maximum | Base Rate | Term Loan | February 1, 2016 Credit Agreement | Line of Credit
Long Term Obligations And Commitments (Textuals)
Basis spread on variable rate	0.875%
Maximum | Base Rate | Revolving Credit Facility | February 1, 2016 Credit Agreement | Line of Credit
Long Term Obligations And Commitments (Textuals)
Basis spread on variable rate	0.50%
Maximum | London Interbank Offered Rate (LIBOR) | Term Loan | February 1, 2016 Credit Agreement | Line of Credit
Long Term Obligations And Commitments (Textuals)
Basis spread on variable rate	1.875%
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | February 1, 2016 Credit Agreement | Line of Credit
Long Term Obligations And Commitments (Textuals)
Basis spread on variable rate	1.50%