Long-Term Obligations (Details) (USD $)	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Jul. 31, 2014	Mar. 12, 2007 5.75 percent fixed-rate notes due 2017 [Member]
Long Term Obligations (Textuals)
Senior notes				$ 500,000,000
Senior notes, rate				5.75%
Cash paid for interest on the Notes	14,000,000	14,000,000
Other long-term obligations
Total deferred rent	61,000,000		62,000,000
Total license fee payable	42,000,000		41,000,000
Long-term income tax liabilities	33,000,000		32,000,000
Long-term deferred income tax liabilities	62,000,000		61,000,000
Other	21,000,000		14,000,000
Total long-term obligations	219,000,000		210,000,000
Less current portion (included in other current liabilities)	(19,000,000)		(17,000,000)
Long-term obligations due after one year	$ 200,000,000		$ 193,000,000