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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Allowance for Doubtful Accounts [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Beginning Balance | $ 2,027 | $ 1,470 | $ 1,153
Charged (credited) to costs and expenses | 7,462 | 8,357 | 7,139
Deductions | (7,777) | (7,800) | (6,822)
Ending Balance | 1,712 | 2,027 | 1,470
Deferred Tax Asset Valuation Allowance [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Beginning Balance | 29,049 | 17,728 | 17,089
Charged (credited) to costs and expenses | 4,450 | 11,321 | 639
Ending Balance | $ 33,499 | $ 29,049 | $ 17,728

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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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