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Accumulated other comprehensive loss (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2015 | Mar. 31, 2005
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Deferred taxes related to adjustments included in AOCI | $ 7,445 | $ 2,566 | $ (6,848) |  |
Change in pension liability and postretirement obligations, tax | (8,010) | (2,097) | 5,205 |  |
Amount of charge in the minimum pension liability component of other comprehensive income |  |  |  |  | $ 534
Pension Plans |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Change in pension liability and postretirement obligations, tax | (8,062) | (2,242) | 4,981 | $ (10,006) |
Postretirement Benefit Plans |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Change in pension liability and postretirement obligations, tax | 35 | 126 | 153 | (935) |
Defined Benefit Postretirement Life Insurance |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Change in pension liability and postretirement obligations, tax | 17 | $ 18 | $ 70 | $ (747) |
Pension Plans | Pension Plans |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Change in pension liability and postretirement obligations, tax | (9,477) |  |  |  |
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) |  |  |  |

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