Current Liabilities (Details)		12 Months Ended
	Feb. 01, 2016 USD ($)	Jul. 31, 2016 USD ($)	Jul. 31, 2015 USD ($)	Jul. 31, 2014 USD ($)	Mar. 12, 2007 USD ($)
Other Current Liabilities
Reserve for product returns		$ 7,000,000	$ 12,000,000
Reserve for rebates		14,000,000	12,000,000
Current portion of license fee payable		10,000,000	10,000,000
Current portion of deferred rent		6,000,000	8,000,000
Interest payable		11,000,000	10,000,000
Executive deferred compensation plan liabilities		69,000,000	63,000,000
Other		44,000,000	35,000,000
Total other current liabilities		161,000,000	150,000,000
Interest paid		37,000,000	32,000,000	$ 32,000,000
Proceeds from borrowings under revolving credit facilities		995,000,000	0	0
Repayments on borrowings under revolving credit facilities		(995,000,000)	0	0
5.75 percent fixed-rate notes due 2017
Current Liabilities (Textuals)
Senior notes					$ 500,000,000
Other Current Liabilities
Senior notes, rate					5.75%
Interest paid		29,000,000	$ 29,000,000	$ 29,000,000
Term loan					$ 500,000,000
February 1, 2016 Credit Agreement
Other Current Liabilities
Debt instrument, term	5 years
Master credit agreement amount	$ 1,500,000,000.0
Term Loan
Other Current Liabilities
Interest paid		4,000,000
Unsecured Debt | Revolving Credit Facility
Other Current Liabilities
Long-term Line of Credit	$ 745,000,000
Line of Credit | February 1, 2016 Credit Agreement
Other Current Liabilities
Debt Instrument, Covenant, Debt To EBITDA Ratio, Maximum	3.25
Debt Instrument, Covenant, EBITDA To Annual Interest Expense Ratio, Minimum	3.00
Line of Credit | Revolving Credit Facility | February 1, 2016 Credit Agreement
Other Current Liabilities
Line of credit facility, face amount	$ 1,000,000,000
Line Of Credit Facility, Increase Limit	$ 250,000,000
Debt Instrument, Maturity Date Extension	2
Proceeds from borrowings under revolving credit facilities		250,000,000
Repayments on borrowings under revolving credit facilities		(250,000,000)
Fair value of amount outstanding		$ 0
Line of Credit | Term Loan | February 1, 2016 Credit Agreement
Current Liabilities (Textuals)
Senior notes	$ 500,000,000
Other Current Liabilities
Term loan	$ 500,000,000
Base Rate | Line of Credit | Revolving Credit Facility | February 1, 2016 Credit Agreement | Minimum
Current Liabilities (Textuals)
Libor plus variable interest rate on advances under credit facilities	0.00%
Base Rate | Line of Credit | Revolving Credit Facility | February 1, 2016 Credit Agreement | Maximum
Current Liabilities (Textuals)
Libor plus variable interest rate on advances under credit facilities	0.50%
Base Rate | Line of Credit | Term Loan | February 1, 2016 Credit Agreement | Minimum
Current Liabilities (Textuals)
Libor plus variable interest rate on advances under credit facilities	0.125%
Base Rate | Line of Credit | Term Loan | February 1, 2016 Credit Agreement | Maximum
Current Liabilities (Textuals)
Libor plus variable interest rate on advances under credit facilities	0.875%
London Interbank Offered Rate (LIBOR) | Line of Credit | Revolving Credit Facility | February 1, 2016 Credit Agreement | Minimum
Current Liabilities (Textuals)
Libor plus variable interest rate on advances under credit facilities	0.90%
London Interbank Offered Rate (LIBOR) | Line of Credit | Revolving Credit Facility | February 1, 2016 Credit Agreement | Maximum
Current Liabilities (Textuals)
Libor plus variable interest rate on advances under credit facilities	1.50%
London Interbank Offered Rate (LIBOR) | Line of Credit | Term Loan | February 1, 2016 Credit Agreement | Minimum
Current Liabilities (Textuals)
Libor plus variable interest rate on advances under credit facilities	1.125%
London Interbank Offered Rate (LIBOR) | Line of Credit | Term Loan | February 1, 2016 Credit Agreement | Maximum
Current Liabilities (Textuals)
Libor plus variable interest rate on advances under credit facilities	1.875%