Changes in Other Comprehensive Loss (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Sep. 30, 2016	Sep. 30, 2016
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance net of tax		$ (98,124)	$ (94,747)
Other comprehensive income (loss) before reclassification		313	(3,969)
Amounts reclassified from other comprehensive loss		794	1,699
Net current period other comprehensive income (loss)		1,107	(2,270)
Ending balance net of tax		(97,017)	(97,017)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance net of tax		687	626
Other comprehensive income (loss) before reclassification		61	183
Amounts reclassified from other comprehensive loss		(14)	(75)
Net current period other comprehensive income (loss)		47	108
Ending balance net of tax		734	734
Retirement Obligations
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance net of tax		(72,600)	(72,824)
Other comprehensive income (loss) before reclassification		(541)	(999)
Amounts reclassified from other comprehensive loss		524	1,206
Net current period other comprehensive income (loss)		(17)	207
Ending balance net of tax		(72,617)	(72,617)
Foreign currency exchange gain/loss
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance net of tax		(24,571)	(20,985)
Other comprehensive income (loss) before reclassification		569	(3,017)
Net current period other comprehensive income (loss)		569	(3,017)
Ending balance net of tax		(24,002)	(24,002)
Change in Derivatives Qualifying as Hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance net of tax		(1,640)	(1,564)
Other comprehensive income (loss) before reclassification		224	(136)
Amounts reclassified from other comprehensive loss		437
Net current period other comprehensive income (loss)		508	432
Ending balance net of tax		(1,132)	(1,132)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax		284	$ 568
Investment income | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss		(21)
Tax expense | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss		7
Tax expense | Retirement Obligations
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss		(282)
Tax expense | Change in Derivatives Qualifying as Hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss		(153)
Cost of products sold | Retirement Obligations
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss	[1]	806
Cost of products sold | Change in Derivatives Qualifying as Hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss		(74)
Interest Expense [Member] | Change in Derivatives Qualifying as Hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss		$ 511

[1] These AOCL components are included in the computation of net periodic pension cost. (See Note 9 — Net Periodic Benefit Cost for additional details.)