Income Taxes (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Income Taxes (Textual) [Abstract]
Foreign net operating loss carry-forwards	$ 101,904
Foreign net operating loss carry-forwards with no expiration date	87,996
Number of years to expire in foreign net operating loss carry-forwards	Next 5-8 Years
State net operating loss carry-forwards	46,504
Number of years to expire in State net operating loss carry-forwards	from 2014-2032
Foreign tax credit carry-forwards	31,079
Number of years to expire in foreign tax credit carry-forwards	from 2018-2022
State research and development credit carry-forwards	3,457
Number of years to expire in state research and development credit carry-forwards	from 2018 to 2027
Valuation allowance increased/ decreased	1,629	34
Percentage of as result of tax holidays reduced consolidated effective tax rate	0.80%	1.50%	2.30%
Total unrecognized tax benefits	31,070
Recognition of interest expense	539	990	33
Recognition of penalties	855	500	780
Accrual of interest on unrecognized tax benefits	1,986	1,507
Accrual for penalties on unrecognized tax benefits	2,840	2,229
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit within twelve months	13,563
Earnings relate to ongoing operations	467,066
Reserve for uncertain tax positions, excluding interest and penalties	29,765	22,343
Reduction of long-term deferred income tax assets	6,768
Significant change in unrecognized tax benefits is reasonably possible amount of expenses to be recognized	$ 5,686