Long-Term Obligations (Details) (USD $)	6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jul. 31, 2013	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	55,000,000		55,000,000
Total license fee payable	50,000,000		48,000,000
Long-term income tax liabilities	39,000,000		38,000,000
Long-term deferred revenue	16,000,000		32,000,000
Long-term deferred income tax liabilities	44,000,000		6,000,000
Other	8,000,000		7,000,000
Total long-term obligations	212,000,000		186,000,000
Less current portion (included in other current liabilities)	(18,000,000)		(19,000,000)
Long-term obligations due after one year	$ 194,000,000		$ 167,000,000