Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Consolidated Statement of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ (3,683)us-gaap_NetIncomeLoss	$ 15,593us-gaap_NetIncomeLoss	$ (3,922)us-gaap_NetIncomeLoss	$ 23,847us-gaap_NetIncomeLoss
Foreign currency translation adjustments	(6,897)	(1,442)	(11,135)	(3,036)
Comprehensive income (loss)	$ (10,580)us-gaap_ComprehensiveIncomeNetOfTax	$ 14,151us-gaap_ComprehensiveIncomeNetOfTax	$ (15,057)us-gaap_ComprehensiveIncomeNetOfTax	$ 20,811us-gaap_ComprehensiveIncomeNetOfTax

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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