Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Prior to Tax Cuts and Jobs Act [Member]
Income Tax Disclosure [Line Items]
Effective income tax rate	36.20%	32.20%	33.50%	32.60%
U.S. federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
Subsequent to Tax Cuts and Jobs Act [Member]
Income Tax Disclosure [Line Items]
Long term liabilities for one time transition tax	$ 21,000		$ 21,000
Reduction of U.S. tax liability on undistributed foreign earnings to estimate of one time transition tax	$ (14,528)		$ (14,528)
Effective income tax rate	19.30%		23.70%
U.S. federal statutory income tax rate	21.00%		21.00%
Subsequent to Tax Cuts and Jobs Act [Member] | Net Income [Member]
Income Tax Disclosure [Line Items]
Adjustment of deferred tax assets and liabilities, amounts	$ (5,426)		$ (5,426)
Subsequent to Tax Cuts and Jobs Act [Member] | Other Comprehensive Income (Loss) [Member]
Income Tax Disclosure [Line Items]
Adjustment of deferred tax assets and liabilities, amounts	$ 9,800		$ 9,800