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Goodwill and intangible assets - Information Regarding Company's Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2021
Schedule Of Intangible Assets And Goodwill [Line Items]      
Total finite-lived intangibles, Gross carrying amount $ 85,040 $ 85,040 $ 85,040
Total finite-lived intangibles, Accumulated amortization (58,615) (50,492) (54,554)
Total 26,425 34,548 30,486
Goodwill, Gross carrying amount 171,620 171,620 171,620
Goodwill, Accumulated amortization 0 0 0
Goodwill, Net carrying amount 171,620 171,620 171,620
Total goodwill and other intangibles, Gross carrying amount 320,460 320,460 320,460
Total goodwill and other intangibles, Accumulated amortization (58,615) (50,492) (54,554)
Total goodwill and other intangibles, Net carrying amount 261,845 269,968 265,906
Trademarks      
Schedule Of Intangible Assets And Goodwill [Line Items]      
Indefinite lived intangibles, Net carrying amount $ 63,800 $ 63,800 $ 63,800
Customer relationships – retailers      
Schedule Of Intangible Assets And Goodwill [Line Items]      
Estimated useful life 10 years 10 years 10 years
Total finite-lived intangibles, Gross carrying amount $ 77,600 $ 77,600 $ 77,600
Total finite-lived intangibles, Accumulated amortization (54,140) (46,380) (50,260)
Total $ 23,460 $ 31,220 $ 27,340
Customer relationships – e-commerce      
Schedule Of Intangible Assets And Goodwill [Line Items]      
Estimated useful life 3 years 3 years 3 years
Total finite-lived intangibles, Gross carrying amount $ 3,940 $ 3,940 $ 3,940
Total finite-lived intangibles, Accumulated amortization (3,921) (3,908) (3,915)
Total $ 19 $ 32 $ 25
Trademarks      
Schedule Of Intangible Assets And Goodwill [Line Items]      
Estimated useful life 10 years 10 years 10 years
Total finite-lived intangibles, Gross carrying amount $ 3,500 $ 3,500 $ 3,500
Total finite-lived intangibles, Accumulated amortization (554) (204) (379)
Total $ 2,946 $ 3,296 $ 3,121