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Goodwill and other intangible assets - Information Regarding Company's Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule Of Intangible Assets And Goodwill [Line Items]
Finite-lived intangibles, Gross carrying amount	$ 85,040	$ 85,040
Finite-lived intangibles, Accumulated amortization	(54,554)	(46,430)
Finite-lived intangibles, Net carrying amount	30,486	38,610
Goodwill, Gross carrying amount	171,620	171,321
Goodwill, Accumulated amortization	0	0
Goodwill, Net carrying amount	171,620	171,321
Goodwill and other intangibles, Gross carrying amount	320,460	320,161
Goodwill and other intangibles, Accumulated amortization	(54,554)	(46,430)
Goodwill and other intangibles, Net carrying amount	265,906	273,731
Trademarks
Schedule Of Intangible Assets And Goodwill [Line Items]
Indefinite-lived intangibles, gross carrying amount	63,800	63,800
Indefinite lived intangibles, Net carrying amount	63,800	63,800
Customer relationships – retailers
Schedule Of Intangible Assets And Goodwill [Line Items]
Finite-lived intangibles, Gross carrying amount	77,600	77,600
Finite-lived intangibles, Accumulated amortization	(50,260)	(42,500)
Finite-lived intangibles, Net carrying amount	$ 27,340	$ 35,100
Finite-lived intangibles, estimated useful life	10 years	10 years
Customer relationships — e-commerce
Schedule Of Intangible Assets And Goodwill [Line Items]
Finite-lived intangibles, Gross carrying amount	$ 3,940	$ 3,940
Finite-lived intangibles, Accumulated amortization	(3,915)	(3,901)
Finite-lived intangibles, Net carrying amount	$ 25	$ 39
Finite-lived intangibles, estimated useful life	3 years	3 years
Trademarks
Schedule Of Intangible Assets And Goodwill [Line Items]
Finite-lived intangibles, Gross carrying amount	$ 3,500	$ 3,500
Finite-lived intangibles, Accumulated amortization	(379)	(29)
Finite-lived intangibles, Net carrying amount	$ 3,121	$ 3,471
Finite-lived intangibles, estimated useful life	10 years	10 years

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