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Accumulated other comprehensive loss (Narrative) (Details) - USD ($)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2016
Mar. 31, 2005
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Deferred taxes related to adjustments included in AOCI $ (13,305,000) $ 7,445,000 $ 2,566,000    
Change in pension liability and postretirement obligations, tax 13,297,000 (8,010,000) (2,097,000)    
Amount of charge in the minimum pension liability component of other comprehensive income         $ 406,000
Accumulated other comprehensive loss (59,986,000) (114,350,000) (83,052,000)    
Other comprehensive income (loss) before reclassification 29,030,000 (29,681,000)      
Amounts reclassified from other comprehensive loss to net income 25,334,000 (1,617,000)      
Net current period other comprehensive (loss) income 54,364,000 (31,298,000)      
Retirement Obligations          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive loss (37,356,000) (79,041,000) (55,145,000)    
Other comprehensive income (loss) before reclassification 24,999,000 (25,449,000)      
Amounts reclassified from other comprehensive loss to net income 16,686,000 1,553,000      
Net current period other comprehensive (loss) income 41,685,000 (23,896,000)      
Retirement Obligations | Cost of products sold          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Amounts reclassified from other comprehensive loss to net income 22,009,000 [1] 2,074,000      
Retirement Obligations | Tax expense          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Amounts reclassified from other comprehensive loss to net income (5,323,000) (521,000)      
Foreign Currency          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive loss (21,776,000) (34,359,000) (25,355,000)    
Other comprehensive income (loss) before reclassification 12,583,000 (9,004,000)      
Amounts reclassified from other comprehensive loss to net income 0 0      
Net current period other comprehensive (loss) income 12,583,000 (9,004,000)      
Change in Derivatives Qualifying as Hedges          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive loss (854,000) (950,000) (2,552,000)    
Other comprehensive income (loss) before reclassification (8,552,000) 4,772,000      
Amounts reclassified from other comprehensive loss to net income 8,648,000 (3,170,000)      
Net current period other comprehensive (loss) income 96,000 1,602,000      
Change in Derivatives Qualifying as Hedges | Cost of products sold          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Amounts reclassified from other comprehensive loss to net income (90,000) (54,000)      
Change in Derivatives Qualifying as Hedges | Tax expense          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Amounts reclassified from other comprehensive loss to net income (721,000) 1,118,000      
Change in Derivatives Qualifying as Hedges | Interest Expense [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Amounts reclassified from other comprehensive loss to net income 1,585,000 (327,000)      
Change in Derivatives Qualifying as Hedges | Foreign Currency          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Amounts reclassified from other comprehensive loss to net income 7,874,000 (3,907,000)      
Change in Derivatives Qualifying as Hedges | income before tax [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Amounts reclassified from other comprehensive loss to net income 9,369,000 (4,288,000)      
Change in Derivatives Qualifying as Hedges | Net of tax expense [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Amounts reclassified from other comprehensive loss to net income 8,648,000 (3,170,000)      
Pension Plans          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Change in pension liability and postretirement obligations, tax 13,261,000 (8,062,000) (2,242,000) $ (7,605,000)  
Postretirement Benefit Plans          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Change in pension liability and postretirement obligations, tax 12,000 35,000 126,000 (935,000)  
Defined Benefit Postretirement Life Insurance          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Change in pension liability and postretirement obligations, tax 24,000 $ 17,000 18,000 $ (747,000)  
Pension Plans | Pension Plans          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Change in pension liability and postretirement obligations, tax (7,251,000)        
Defined Benefit Postretirement Life Insurance | Defined Benefit Postretirement Life Insurance          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Change in pension liability and postretirement obligations, tax $ (194,000)        
Accounting Standards Update 2016-01 [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Amounts reclassified from other comprehensive loss to net income     $ (888,000)    
[1]
20.     Accumulated Other Comprehensive Loss
 
The components of accumulated other comprehensive loss is as follows:
 March 31,
 20212020
Foreign currency translation adjustment – net of tax$(21,776)$(34,359)
Pension liability – net of tax(38,081)(79,651)
Postretirement obligations – net of tax1,989 1,950 
Split-dollar life insurance arrangements – net of tax(1,264)(1,340)
Derivatives qualifying as hedges – net of tax(854)(950)
Accumulated other comprehensive loss$(59,986)$(114,350)
 
The deferred taxes related to the adjustments associated with the items included in accumulated other comprehensive loss, net of deferred tax asset valuation allowances, were $(13,305,000), $7,445,000, and $2,566,000 for fiscal 2021, 2020, and 2019 respectively.  Refer to Note 17 for discussion of the deferred tax asset valuation allowance.  In the period subsequent to our initial recording of the valuation allowance in fiscal 2011, increases and decreases to both the deferred tax assets associated with items in accumulated other comprehensive loss, and the valuation allowance, have been recorded as offsets to comprehensive income.

As a result of the Act as described in Note 17, the Company recorded as an offsetting entry a $(7,251,000) stranded tax effect in the minimum pension liability component and a $(194,000) stranded tax effect in the split dollar life insurance arrangement component of other comprehensive income in fiscal 2018. The stranded tax effect related to the other post retirement obligations component was not material.

As a result of the recording of a deferred tax asset valuation allowance in fiscal 2011, the Company recorded as an offsetting entry a $7,605,000 stranded tax effect in the minimum pension liability component, $935,000 stranded tax effect in the other post retirement obligations component and a $747,000 stranded tax effect in the split dollar life insurance arrangement component of other comprehensive income. With the reversal of that valuation allowance in fiscal 2013, the Company recorded the reversal of the valuation allowance as a reduction of income taxes in the consolidated statement of operations.

As a result of the recording of a deferred tax asset valuation allowance in fiscal 2005, the Company recorded as an offsetting entry a $406,000 stranded tax effect in the minimum pension liability component of other comprehensive income. With the reversal of that valuation allowance in fiscal 2006, the Company recorded the reversal of the valuation allowance as a reduction of income taxes in the consolidated statement of operations.

The stranded tax effects described above are in accordance with ASC Topic 740, “Income Taxes” even though the impact of the act and the deferred tax asset valuation allowance described above were initially established as an adjustment to comprehensive income. This amount will remain indefinitely as a component of accumulated other comprehensive loss.

The activity by year related to investments, including reclassification adjustments for activity included in earnings are as follows (all items shown net of tax):
 Year Ended March 31,
 202120202019
Net unrealized investment gain (loss) at beginning of year$— $— $888 
Unrealized holdings gain (loss) arising during the period— — — 
Reclassification adjustments for gain included in earnings— — — 
Adoption of ASU 2016-01— — (888)
Net change in unrealized gain (loss) on investments— — (888)
Net unrealized investment gain at end of year$— $— $— 
Changes in accumulated other comprehensive income by component are as follows (in thousands):

 March 31, 2021
 Retirement ObligationsForeign CurrencyChange in Derivatives Qualifying as HedgesTotal
Beginning balance net of tax$(79,041)$(34,359)$(950)(114,350)
Other comprehensive income (loss) before reclassification24,999 12,583 (8,552)29,030 
Amounts reclassified from other comprehensive loss to net income16,686 — 8,648 25,334 
Net current period other comprehensive (loss) income41,685 12,583 96 54,364 
Ending balance net of tax$(37,356)$(21,776)$(854)$(59,986)

 March 31, 2020
 Retirement ObligationsForeign CurrencyChange in Derivatives Qualifying as HedgesTotal
Beginning balance net of tax$(55,145)$(25,355)$(2,552)(83,052)
Other comprehensive income (loss) before reclassification(25,449)(9,004)4,772 (29,681)
Amounts reclassified from other comprehensive loss to net income1,553 — (3,170)(1,617)
Net current period other comprehensive (loss) income(23,896)(9,004)1,602 (31,298)
Ending balance net of tax$(79,041)$(34,359)$(950)$(114,350)


Details of amounts reclassified out of accumulated other comprehensive loss for the year ended March 31, 2021 are as follows (in thousands):
Details of AOCL ComponentsAmount reclassified from AOCLAffected line item on consolidated statement of operations
Net pension amount unrecognized 
 $22,009 (1)
 22,009 Total before tax
 (5,323)Tax benefit
 $16,686 Net of tax
Change in derivatives qualifying as hedges 
 $(90)Cost of products sold
1,585 Interest expense
7,874 Foreign currency
 9,369 Total before tax
 (721)Tax benefit
 $8,648 Net of tax
(1)These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. (See Note 13 — Pensions and Other Benefit Plans for additional details.)

Details of amounts reclassified out of accumulated other comprehensive loss for the year ended March 31, 2020 are as follows (in thousands):
Details of AOCL ComponentsAmount reclassified from AOCLAffected line item on consolidated statement of operations
Net pension amount unrecognized 
 $2,074 (1)
 2,074 Total before tax
 (521)Tax benefit
 $1,553 Net of tax
Change in derivatives qualifying as hedges 
 $(54)Cost of products sold
(327)Interest expense
(3,907)Foreign currency
 (4,288)Total before tax
 1,118 Tax benefit
 $(3,170)Net of tax

(1)These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. (See Note 13 — Pensions and Other Benefit Plans for additional details.)