Changes in Other Comprehensive Loss (Narrative) (Details) - USD ($)		3 Months Ended	9 Months Ended
		Dec. 31, 2019	Dec. 31, 2019	Sep. 30, 2018
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance net of tax		$ (90,908,000)	$ (83,052,000)
Other comprehensive income (loss) before reclassification		1,811,000	(1,945,000)
Amounts reclassified from other comprehensive loss		4,337,000	237,000
Net current period other comprehensive income (loss)		6,148,000	(1,708,000)
Ending balance net of tax		(84,760,000)	(84,760,000)
Retirement Obligations
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance net of tax		(54,962,000)	(55,145,000)
Other comprehensive income (loss) before reclassification		(567,000)	(1,175,000)
Amounts reclassified from other comprehensive loss		374,000	1,165,000
Net current period other comprehensive income (loss)		(193,000)	(10,000)
Ending balance net of tax		(55,155,000)	(55,155,000)
Foreign currency exchange (gain) loss
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance net of tax		(32,430,000)	(25,355,000)
Other comprehensive income (loss) before reclassification		5,479,000	(1,596,000)
Amounts reclassified from other comprehensive loss		0	0
Net current period other comprehensive income (loss)		5,479,000	(1,596,000)
Ending balance net of tax		(26,951,000)	(26,951,000)
Change in Derivatives Qualifying as Hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss		5,292,000	(1,239,000)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax		3,963,000	(928,000)
Tax expense | Retirement Obligations
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss		(125,000)	(395,000)
Tax expense | Change in Derivatives Qualifying as Hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss		(1,329,000)	311,000
Cost of products sold | Retirement Obligations
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss	[1]	499,000	1,560,000
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		(65,000)	(76,000)
Interest Expense [Member] | Change in Derivatives Qualifying as Hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss		0	(479,000)
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		5,357,000	(684,000)
Change in Derivatives Qualifying as Hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance net of tax		(3,516,000)	(2,552,000)
Other comprehensive income (loss) before reclassification		(3,101,000)	826,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax		3,963,000	(928,000)
Net current period other comprehensive income (loss)		862,000	(102,000)
Ending balance net of tax		$ (2,654,000)	$ (2,654,000)
Accounting Standards Update 2016-01 [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ (888,000)

[1] 14.    Changes in Accumulated Other Comprehensive Loss
Changes in AOCL by component for the three and nine-month period ended December 31, 2019 are as follows (in thousands):    
Three months ended December 31, 2019  
Retirement Obligations
Foreign Currency
Change in Derivatives Qualifying as Hedges
Total Beginning balance net of tax
$ (54,962 )
$ (32,430 )
$ (3,516 )
$ (90,908 ) Other comprehensive income (loss) before reclassification
(567 )
5,479

(3,101 )
1,811
Amounts reclassified from other comprehensive loss
374

—

3,963

4,337
Net current period other comprehensive income (loss)
(193 )   5,479
  862
  6,148
Ending balance net of tax
$ (55,155 )   $ (26,951 )   $ (2,654 )   $ (84,760 )

    Nine months ended December 31, 2019     Retirement Obligations   Foreign Currency   Change in Derivatives Qualifying as Hedges   Total Beginning balance net of tax   $ (55,145 )   $ (25,355 )   $ (2,552 )   $ (83,052 ) Other comprehensive income (loss) before reclassification   (1,175 )   (1,596 )   826
  (1,945 ) Amounts reclassified from other comprehensive loss   1,165
  —
  (928 )   237
Net current period other comprehensive income (loss)   (10 )   (1,596 )   (102 )   (1,708 ) Ending balance net of tax   $ (55,155 )   $ (26,951 )   $ (2,654 )   $ (84,760 )

Details of amounts reclassified out of AOCL for the three-month period ended December 31, 2019 are as follows (in thousands): Details of AOCL Components   Amount reclassified from AOCL   Affected line item on Condensed Consolidated Statement of Operations Net amortization of prior service cost and pension settlement    
 
    $ 499
  (1)     499
  Total before tax     (125 )   Tax (benefit) expense     $ 374
  Net of tax
 

 
Change in derivatives qualifying as hedges    
        $ (65 )   Cost of products sold     —
  Interest expense     5,357
  Foreign currency     5,292
  Total before tax     (1,329 )   Tax (benefit) expense     $ 3,963
  Net of tax

Details of amounts reclassified out of AOCL for the nine-month period ended December 31, 2019 are as follows (in thousands): Details of AOCL Components   Amount reclassified from AOCL   Affected line item on Condensed Consolidated Statement of Operations Net amortization of prior service cost and pension settlement    
 
    $ 1,560
  (1)     1,560
  Total before tax     (395 )   Tax (benefit) expense     $ 1,165
  Net of tax
 

 
Change in derivatives qualifying as hedges    
        $ (76 )   Cost of products sold     (479 )   Interest expense     (684 )   Foreign currency     (1,239 )   Total before tax     311
  Tax (benefit) expense     $ (928 )   Net of tax
(1) These AOCL components are included in the computation of net periodic pension cost. (See Note 10 — Net Periodic Benefit Cost for additional details.)