The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 810
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Name:	us-gaap_ProfitLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Stockholders' Equity - Stock Repurchase Plan, Retained Earnings Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017
Increase (Decrease) in Stockholders' Equity
Net income (loss)	$ 49,559	$ 39,305	$ 7,438	$ (19,613)
Retained Earnings
Increase (Decrease) in Stockholders' Equity
Beginning balance			819,589
Net income (loss)			7,438
Cumulative effect of new accounting principle in period of adoption					$ 1,365
Ending balance	$ 828,392		$ 828,392