Long-Term Obligations and Commitments (Details) - USD ($)	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Nov. 09, 2015	Jul. 31, 2015	Mar. 12, 2007
Long Term Obligations (Textuals)
Cash paid for interest on the Notes	$ 14,000,000	$ 14,000,000
Other long-term obligations
Total deferred rent	63,000,000			$ 49,000,000
Total license fee payable	35,000,000			34,000,000
Long-term income tax liabilities	45,000,000			45,000,000
Long-term deferred income tax liabilities	51,000,000			50,000,000
Other	12,000,000			13,000,000
Total long-term obligations	206,000,000			191,000,000
Less current portion (included in other current liabilities)	(22,000,000)			(19,000,000)
Long-term obligations due after one year	$ 184,000,000			$ 172,000,000
Capital Addition Purchase Commitments | Subsequent Event
Other long-term obligations
Payments to acquire buildings			$ 262,000,000
5.75 percent fixed-rate notes due 2017
Long Term Obligations (Textuals)
Senior notes					$ 500,000,000
Senior notes, rate					5.75%