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Restructuring - Restructuring Charges (Details) | 12 Months Ended
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Mar. 31, 2021 USD ($) office | Mar. 31, 2020 USD ($) office | Mar. 31, 2019 USD ($)
Restructuring and Related Activities [Abstract] |  |  |
Employee severance and related costs | $ 19,040,000 | $ 16,834,000 | $ 12,133,000
Lease impairments related costs | 1,684,000 | 2,761,000 | 0
Stock-based compensation | 2,747,000 | 1,753,000 | 2,632,000
Total restructuring charges | $ 23,471,000 | $ 21,348,000 | $ 14,765,000
Number of leases related to lease impairment | office | 7 | 6 |

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- Definition Amount of loss from impairment of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 25 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121593497&loc=SL77918431-209957 + Details
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