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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

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