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Schedule II - Valuation and Qualifying Accounts (Detail) - Deferred Tax Asset Valuation Allowance [Member] - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 30, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Beginning Balance |  |  | $ 78,071 | $ 47,076 | $ 42,621
Charged to costs and expenses |  | $ 69,000 | 71,976 | 5,119 | 4,455
Charged to goodwill | [1] |  |  | 25,876 |
Ending Balance |  |  | $ 150,047 | $ 78,071 | $ 47,076
[1] | Related to the acquisitions of RigNet and EBI

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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 https://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 https://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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