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Accumulated other comprehensive loss (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2017 | Mar. 31, 2005
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Deferred taxes related to adjustments included in AOCI | $ (5,780,000) |  | $ (13,305,000) | $ 7,445,000 |  |
Change in pension liability and postretirement obligations, tax | 5,279,000 |  | 13,297,000 | (8,010,000) |  |
Amount of charge in the minimum pension liability component of other comprehensive income |  |  |  |  |  | $ 406,000
Accumulated other comprehensive loss | (49,899,000) |  | (59,986,000) | (114,350,000) |  |
Other comprehensive income (loss) before reclassification | 15,017,000 |  | 29,030,000 |  |  |
Amounts reclassified from other comprehensive loss to net income | (4,930,000) |  | 25,334,000 |  |  |
Net current period other comprehensive (loss) income | 10,087,000 |  | 54,364,000 |  |  |
Retirement Obligations |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated other comprehensive loss | (21,043,000) |  | (37,356,000) | (79,041,000) |  |
Other comprehensive income (loss) before reclassification | 15,398,000 |  | 24,999,000 |  |  |
Amounts reclassified from other comprehensive loss to net income | 915,000 |  | 16,686,000 |  |  |
Net current period other comprehensive (loss) income | 16,313,000 |  | 41,685,000 |  |  |
Retirement Obligations | Cost of products sold |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amounts reclassified from other comprehensive loss to net income | 1,237,000 | [1] | 22,009,000 |  |  |
Retirement Obligations | Tax expense |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amounts reclassified from other comprehensive loss to net income | (322,000) |  | (5,323,000) |  |  |
Foreign Currency |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated other comprehensive loss | (28,079,000) |  | (21,776,000) | (34,359,000) |  |
Other comprehensive income (loss) before reclassification | (6,303,000) |  | 12,583,000 |  |  |
Amounts reclassified from other comprehensive loss to net income | 0 |  | 0 |  |  |
Net current period other comprehensive (loss) income | (6,303,000) |  | 12,583,000 |  |  |
Change in Derivatives Qualifying as Hedges |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated other comprehensive loss | (777,000) |  | (854,000) | (950,000) |  |
Other comprehensive income (loss) before reclassification | 5,922,000 |  | (8,552,000) |  |  |
Amounts reclassified from other comprehensive loss to net income | (5,845,000) |  | 8,648,000 |  |  |
Net current period other comprehensive (loss) income | 77,000 |  | 96,000 |  |  |
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 | 85,000 |  | (90,000) |  |  |
Change in Derivatives Qualifying as Hedges | Tax expense |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amounts reclassified from other comprehensive loss to net income | 2,452,000 |  | (721,000) |  |  |
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 | 2,868,000 |  | 1,585,000 |  |  |
Change in Derivatives Qualifying as Hedges | Foreign Currency |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amounts reclassified from other comprehensive loss to net income | (11,250,000) |  | 7,874,000 |  |  |
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 | (8,297,000) |  | 9,369,000 |  |  |
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 | (5,845,000) |  | 8,648,000 |  |  |
Pension Plans |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Change in pension liability and postretirement obligations, tax | 5,282,000 |  | 13,261,000 | (8,062,000) | $ (7,605,000) |
Postretirement Benefit Plans |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Change in pension liability and postretirement obligations, tax | (48,000) |  | 12,000 | 35,000 | (935,000) |
Defined Benefit Postretirement Life Insurance |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Change in pension liability and postretirement obligations, tax | 45,000 |  | $ 24,000 | $ 17,000 | $ (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) |  |  |  |  |
[1] | 20. Accumulated Other Comprehensive Loss The components of accumulated other comprehensive loss is as follows:
|  | March 31,
|  | 2022 |  | 2021
Foreign currency translation adjustment – net of tax |  | $ | (28,080) |  |  | $ | (21,776) |
Pension liability – net of tax |  | (21,794) |  |  | (38,081) |
Postretirement obligations – net of tax |  | 1,836 |  |  | 1,989 |
Split-dollar life insurance arrangements – net of tax |  | (1,084) |  |  | (1,264) |
Derivatives qualifying as hedges – net of tax |  | (777) |  |  | (854) |
Accumulated other comprehensive loss |  | $ | (49,899) |  |  | $ | (59,986) |
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 $(5,780,000), $(13,305,000), and $7,445,000 for fiscal 2022, 2021, and 2020 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 Tax Cuts and Jobs Act (the "Act"), 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. Changes in accumulated other comprehensive income by component are as follows (in thousands):
|  | March 31, 2022
|  |  | Retirement Obligations |  | Foreign Currency |  | Change in Derivatives Qualifying as Hedges |  | Total
Beginning balance net of tax |  |  | $ | (37,356) |  |  | $ | (21,776) |  |  | $ | (854) |  |  | (59,986) |
Other comprehensive income (loss) before reclassification |  |  | 15,398 |  |  | (6,303) |  |  | 5,922 |  |  | 15,017 |
Amounts reclassified from other comprehensive loss to net income |  |  | 915 |  |  | — |  |  | (5,845) |  |  | (4,930) |
Net current period other comprehensive (loss) income |  |  | 16,313 |  |  | (6,303) |  |  | 77 |  |  | 10,087 |
Ending balance net of tax |  |  | $ | (21,043) |  |  | $ | (28,079) |  |  | $ | (777) |  |  | $ | (49,899) |
|  | March 31, 2021
|  |  | Retirement Obligations |  | Foreign Currency |  | Change in Derivatives Qualifying as Hedges |  | Total
Beginning balance net of tax |  |  | $ | (79,041) |  |  | $ | (34,359) |  |  | $ | (950) |  |  | (114,350) |
Other comprehensive income (loss) before reclassification |  |  | 24,999 |  |  | 12,583 |  |  | (8,552) |  |  | 29,030 |
Amounts reclassified from other comprehensive loss to net income |  |  | 16,686 |  |  | — |  |  | 8,648 |  |  | 25,334 |
Net current period other comprehensive (loss) income |  |  | 41,685 |  |  | 12,583 |  |  | 96 |  |  | 54,364 |
Ending balance net of tax |  |  | $ | (37,356) |  |  | $ | (21,776) |  |  | $ | (854) |  |  | $ | (59,986) |
Details of amounts reclassified out of accumulated other comprehensive loss for the year ended March 31, 2022 are as follows (in thousands):
Details of AOCL Components |  | Amount reclassified from AOCL |  | Affected line item on consolidated statement of operations
Net pension amount unrecognized |  |  |  |
|  | $ | 1,237 |  |  | (1)
|  | 1,237 |  |  | Total before tax
|  | (322) |  |  | Tax benefit
|  | $ | 915 |  |  | Net of tax
Change in derivatives qualifying as hedges |  |  |  |
|  | $ | 85 |  |  | Cost of products sold
|  | 2,868 |  |  | Interest expense
|  | (11,250) |  |  | Foreign currency
|  | (8,297) |  |  | Total before tax
|  | 2,452 |  |  | Tax benefit
|  | $ | (5,845) |  |  | 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, 2021 are as follows (in thousands):
Details of AOCL Components |  | Amount reclassified from AOCL |  | Affected 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.)

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