Fair Value Measurements (Details) $ in Thousands	Sep. 30, 2017 USD ($)
Level 1
Assets:
Total Assets	$ 0
Liabilities:
Total Liabilities	0
Level 1 | Foreign currency forward exchange contracts
Assets:
Foreign currency contract, asset fair value	0
Liabilities:
Foreign currency contract, liability fair value	0
Level 1 | Foreign currency option contracts
Assets:
Foreign currency contract, asset fair value	0
Liabilities:
Foreign currency contract, liability fair value	0
Level 2
Assets:
Total Assets	8,952
Liabilities:
Total Liabilities	33,931
Level 2 | Foreign currency forward exchange contracts
Assets:
Foreign currency contract, asset fair value	8,885
Liabilities:
Foreign currency contract, liability fair value	33,931
Level 2 | Foreign currency option contracts
Assets:
Foreign currency contract, asset fair value	67
Liabilities:
Foreign currency contract, liability fair value	0
Level 3
Assets:
Total Assets	0
Liabilities:
Total Liabilities	0
Level 3 | Foreign currency forward exchange contracts
Assets:
Foreign currency contract, asset fair value	0
Liabilities:
Foreign currency contract, liability fair value	0
Level 3 | Foreign currency option contracts
Assets:
Foreign currency contract, asset fair value	0
Liabilities:
Foreign currency contract, liability fair value	0
Fair Value
Assets:
Total Assets	8,952
Liabilities:
Total Liabilities	33,931
Fair Value | Foreign currency forward exchange contracts
Assets:
Foreign currency contract, asset fair value	8,885
Liabilities:
Foreign currency contract, liability fair value	33,931
Fair Value | Foreign currency option contracts
Assets:
Foreign currency contract, asset fair value	67
Liabilities:
Foreign currency contract, liability fair value	$ 0