Pension Plans (Narrative) (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Compensation and Retirement Disclosure [Abstract]
Defined benefit pension plan, liabilities	$ 44,800	$ 44,800	$ 44,800
Defined benefit pension plan liabilities, current	700	700	700
Defined benefit pension plan, liabilities, noncurrent	44,100	44,100	44,100
Defined benefit plans change in obligation due to actuarial gain (loss) due to change in discount rate	8,900		(3,100)
Expected periodic pension cost in current fiscal year			3,200
Benefits paid	$ 100	$ 325	300
Defined benefit plan expected contributions in current fiscal year			$ 500