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Restructuring and other related costs - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	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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Accelerated Lease Cost

+ References

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- Definition

Restructuring and Related Cost, Number of Stores Closed

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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

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