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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | $ 122 | $ 489 | $ 104
Charged (Credited) to Costs and Expenses | 333 | (246) | 569
Charged to Other Accounts | 84 | 0 | 0
Write-offs/Deductions | (56) | (121) | (184)
Balance at End of Year | 483 | 122 | 489
Valuation allowance for deferred taxes |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 61,702 | 50,160 | 58,350
Charged (Credited) to Costs and Expenses | 16,637 | 11,542 | (8,190)
Charged to Other Accounts | 0 | 0 | 0
Write-offs/Deductions | 0 | 0 | 0
Balance at End of Year | $ 78,339 | $ 61,702 | $ 50,160

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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