Restructuring Costs Restructuring costs (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Costs [Line Items]
Restructuring and impairment costs	[1]	$ 3,682	$ 0	$ 3,682	$ 2,389

[1] Restructuring and impairment costs are excluded from segment operating income, but are included in consolidated operating income in the consolidated statements of income and comprehensive income.