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Restructuring and other related costs - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Feb. 28, 2019 store | Mar. 31, 2019 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($)
Restructuring and Related Activities [Abstract] |  |  |  |
Number of stores closed | store | 22 |  |  |
Gain from extinguishment of lease liabilities |  | $ 1,866 |  | $ 7,733
Acceleration of rent expense |  | $ 16,106 | $ 0 | $ 0

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- Definition Restructuring and Related Cost, Number of Stores Closed + References No definition available. + Details
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- Definition Amount of gain (loss) on termination of lease before expiration of lease term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 40 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121604053&loc=SL77918607-209975 + Details
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