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Goodwill and other intangible assets - Information Regarding Company's Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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