Income Taxes - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013 Rate	Jul. 31, 2012	Jul. 31, 2011
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits	$ 17,849	$ 37,575	$ 36,532	$ 22,343
Foreign Net Operating Loss Carryforwards Expiration Dates	five to eight years
State Net Operating Loss Carryforwards Expiration Dates	2015 to 2033
Foreign Tax Credit Carryforward Expiration Dates	2018 to 2024
State Research And Development Tax Credit Carryforward Expiration Dates	2015 to 2029
Valuation Allowance, Deferred Tax Asset, Change in Amount	267	11,295
Effective Income Tax Rate Reconciliation, Tax Holidays		0.70%
Unrecognized Tax Benefits, Interest on Income Taxes Expense	498	200	539
Unrecognized Tax Benefits, Income Tax Penalties Expense	25	313	855
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	1,739	2,265
Unrecognized Tax Benefits, Income Tax Penalties Accrued	2,664	2,689
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	688
Unrecognized Tax Benefits Recognized In Other Liabilities	11,357	32,759
Document Period End Date	Jul. 31, 2014
Reduction Of Longterm Deferred Income Tax Assets Excluding Interest and Penalties	6,492	4,816
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	4,111
Undistributed Earnings of Foreign Subsidiaries	433,382
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	114,219
Other Tax Carryforward, Gross Amount	14,812
Foreign, no expiration date [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	88,297
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	59,349
Other Tax Carryforward, Gross Amount	10,731
Maximum recorded through earnings [Member]
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits, Income Tax Penalties Accrued	$ 688
United States, Federal [Member] | Low end of range [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year	2013
United States, Federal [Member] | High end of range [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year	2014
FRANCE | Low end of range [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year	2013
FRANCE | High end of range [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year	2014
GERMANY | Low end of range [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year	2009
GERMANY | High end of range [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year	2014
UNITED KINGDOM | Low end of range [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year	2011
UNITED KINGDOM | High end of range [Member]
Operating Loss Carryforwards [Line Items]
Open Tax Year	2014