Components of Other Gains (Losses), Net (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Gain (Loss) on Investments [Line Items]
Derecognition of accrued pricing liabilities		$ 11,811	$ 13,545
Foreign currency exchange gain (losses)	(2,050)	2,948	(4,023)
Gain on sale of investments	28	9	187
Gain (loss) on disposal of assets	69	(9)	(14)
Other, net	(689)	(369)	(803)
Other Operating Income (Expense), Net, Total	$ (2,642)	$ 14,390	$ 8,892