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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Deferred Tax Valuation Allowance [Member] |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of year | $ 57,852 | $ 54,260 | $ 80,013
Charged to costs and expenses | 8,967 | 3,592 | (25,753)
Balance at end of year | 66,819 | 57,852 | 54,260
Allowance for Doubtful Accounts [Member] |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of year | 788 | 900 | 509
Charged to costs and expenses | 1,434 | 539 | 1,063
Deductions | (588) | (651) | (672)
Balance at end of year | $ 1,634 | $ 788 | $ 900

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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) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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