Changes in Other Comprehensive Loss (Narrative) (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2020 USD ($)
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance net of tax	$ (114,350)
Other comprehensive income (loss) before reclassification	(660)
Amounts reclassified from other comprehensive loss	5,318
Net current period other comprehensive income (loss)	4,658
Ending balance net of tax	(109,692)
Retirement Obligations
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance net of tax	(79,041)
Other comprehensive income (loss) before reclassification	(890)
Amounts reclassified from other comprehensive loss	2,759
Net current period other comprehensive income (loss)	1,869
Ending balance net of tax	(77,172)
Foreign currency exchange (gain) loss
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance net of tax	(34,359)
Other comprehensive income (loss) before reclassification	2,802
Amounts reclassified from other comprehensive loss	0
Net current period other comprehensive income (loss)	2,802
Ending balance net of tax	(31,557)
Change in Derivatives Qualifying as Hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss	3,291
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	2,559
Tax expense | Retirement Obligations
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss	(792)
Tax expense | Change in Derivatives Qualifying as Hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss	(732)
Cost of products sold | Retirement Obligations
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss	3,551
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	(10)
Interest Expense [Member] | Change in Derivatives Qualifying as Hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss	337
Foreign currency exchange (gain) loss | Change in Derivatives Qualifying as Hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss	2,964
Change in Derivatives Qualifying as Hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance net of tax	(950)
Other comprehensive income (loss) before reclassification	(2,572)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	2,559
Net current period other comprehensive income (loss)	(13)
Ending balance net of tax	$ (963)