Income Taxes (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Income Taxes (Textuals) [Abstract]
Foreign net operating loss carry-forwards	$ 84,182
Foreign net operating loss carry-forwards with no expiration date	73,388
Number of years to expire in foreign net operating loss carry-forwards	Next 5 Years
State net operating loss carry-forwards	71,880
Number of years to expire in State net operating loss carry-forwards	from 2014-2030
Foreign tax credit carry-forwards	28,304
Number of years to expire in foreign tax credit carry-forwards	from 2018-2021
State research and development credit carry-forwards	346
Number of years to expire in state research and development credit carry-forwards	from 2017 to 2029
Valuation allowance increased/ decreased	(34)	1,840
Percentage of as result of tax holidays reduced consolidated effective tax rate	1.50%	2.30%	3.30%
Total unrecognized tax benefits	22,343	17,668
Recognition of interest expense	(990)	33	427
Recognition of penalties	500	780	414
Accrual of interest on unrecognized tax benefits	1,507	2,473
Accrual for penalties on unrecognized tax benefits	2,229	1,592
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit within twelve months	2,351
Earnings relate to ongoing operations	$ 455,812