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Pension and Other Benefits (Details) - USD ($) | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Change in pension liability and postretirement obligations, net of tax | $ 23,896,000 | $ 5,166,000 | $ (12,737,000)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 321,902,000 |  |
Fair value of plan assets at end of year | 313,366,000 | 321,902,000 |
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 4,945,000 |  |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | 410,181,000 | 395,202,000 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets | 254,508,000 | 264,211,000 |
Assets for Plan Benefits, Defined Benefit Plan | 6,587,000 | 6,424,000 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | 0 | 0 | 5,000
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (26,852,000) | (27,068,000) |
Change in pension liability and postretirement obligations, net of tax | 0 | 0 | 17,000
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 446,397,000 | 462,284,000 |
Service cost | 1,139,000 | 1,078,000 | 2,580,000
Interest cost | 14,759,000 | 15,526,000 | 16,488,000
Actuarial (gain) loss | 26,193,000 | 4,074,000 |
Benefits paid | (26,852,000) | (27,068,000) |
Foreign exchange rate changes | (1,770,000) | (9,497,000) |
Benefit obligation at end of year | 459,866,000 | 446,397,000 | 462,284,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 321,902,000 | 326,745,000 |
Actual gain (loss) on plan assets | 7,512,000 | 11,333,000 |
Employer contribution | 10,967,000 | 11,018,000 |
Foreign exchange rate changes | (163,000) | (126,000) |
Fair value of plan assets at end of year | 313,366,000 | 321,902,000 | 326,745,000
Funded status | (146,500,000) | (124,495,000) |
Unrecognized actuarial loss |  | (73,836,000) |
Net amount recognized | (40,622,000) | (50,659,000) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |
Accrued liabilities | (3,563,000) | (3,546,000) |
Other non-current liabilities | (149,524,000) | (127,373,000) |
Net amount recognized | (40,622,000) | (50,659,000) |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax | 105,878,000 | 73,836,000 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 2,290,000 | 489,000 | 690,000
Postretirement Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (192,000) | (250,000) |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation at beginning of year | 2,348,000 | 3,284,000 |
Interest cost | 71,000 | 92,000 | 126,000
Actuarial (gain) loss | 340,000 | 778,000 |
Benefit obligation at end of year | 1,887,000 | 2,348,000 | 3,284,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Funded status | (1,887,000) | (2,348,000) |
Net amount recognized | (3,304,000) | (3,630,000) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |
Accrued liabilities | (270,000) | (326,000) |
Other non-current liabilities | (1,617,000) | (2,022,000) |
Net amount recognized | (3,304,000) | (3,630,000) |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax | 1,417,000 | 1,282,000 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (134,000) | (64,000) | $ 121,000
Equity Securities [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 103,017,000 |  |
Fair value of plan assets at end of year | 94,336,000 | 103,017,000 |
Fixed Income Securities [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 205,957,000 |  |
Fair value of plan assets at end of year | 199,613,000 | 205,957,000 |
Real Estate Funds [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 9,978,000 |  |
Fair value of plan assets at end of year | 9,401,000 | 9,978,000 |
Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 2,950,000 |  |
Fair value of plan assets at end of year | 10,016,000 | 2,950,000 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 66,072,000 |  |
Fair value of plan assets at end of year | 91,320,000 | 66,072,000 |
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 59,703,000 |  |
Fair value of plan assets at end of year | 52,084,000 | 59,703,000 |
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 602,000 |  |
Fair value of plan assets at end of year | 24,014,000 | 602,000 |
Fair Value, Inputs, Level 1 [Member] | Real Estate Funds [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 2,817,000 |  |
Fair value of plan assets at end of year | 5,206,000 | 2,817,000 |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 2,950,000 |  |
Fair value of plan assets at end of year | 10,016,000 | 2,950,000 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 153,941,000 |  |
Fair value of plan assets at end of year | 139,498,000 | 153,941,000 |
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 0 |  |
Fair value of plan assets at end of year | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 153,941,000 |  |
Fair value of plan assets at end of year | 139,498,000 | 153,941,000 |
Fair Value, Inputs, Level 2 [Member] | Real Estate Funds [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 0 |  |
Fair value of plan assets at end of year | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 0 |  |
Fair value of plan assets at end of year | 0 | 0 |
(Level 3) |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 5,701,000 |  |
Fair value of plan assets at end of year | 5,503,000 | 5,701,000 |
(Level 3) | Equity Securities [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 0 |  |
Fair value of plan assets at end of year | 0 | 0 |
(Level 3) | Fixed Income Securities [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 5,701,000 |  |
Fair value of plan assets at end of year | 5,503,000 | 5,701,000 |
(Level 3) | Real Estate Funds [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 0 |  |
Fair value of plan assets at end of year | 0 | 0 |
(Level 3) | Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 0 |  |
Fair value of plan assets at end of year | 0 | 0 |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 96,188,000 |  |
Fair value of plan assets at end of year | 77,045,000 | 96,188,000 |
Fair Value Measured at Net Asset Value Per Share [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 43,314,000 |  |
Fair value of plan assets at end of year | 42,252,000 | 43,314,000 |
Fair Value Measured at Net Asset Value Per Share [Member] | Fixed Income Securities [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 45,713,000 |  |
Fair value of plan assets at end of year | 30,598,000 | 45,713,000 |
Fair Value Measured at Net Asset Value Per Share [Member] | Real Estate Funds [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 7,161,000 |  |
Fair value of plan assets at end of year | 4,195,000 | 7,161,000 |
Fair Value Measured at Net Asset Value Per Share [Member] | Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 0 |  |
Fair value of plan assets at end of year | $ 0 | $ 0 |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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