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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, 2020 | Mar. 31, 2019 | Dec. 31, 2018
Schedule Of Intangible Assets And Goodwill [Line Items] |  |  |
Finite-lived intangibles, Gross carrying amount | $ 85,040 | $ 72,700 | $ 72,700
Finite-lived intangibles, Accumulated amortization | (46,430) | (39,447) | (37,727)
Finite-lived intangibles, Net carrying amount | 38,610 | 33,253 | 34,973
Goodwill, Gross carrying amount | 171,321 | 157,264 | 157,264
Goodwill, Accumulated amortization | 0 | 0 | 0
Goodwill, Net carrying amount | 171,321 | 157,264 | 157,264
Goodwill and other intangibles, Gross carrying amount | 320,161 | 293,764 | 293,764
Goodwill and other intangibles, Accumulated amortization | (46,430) | (39,447) | (37,727)
Goodwill and other intangibles, Net carrying amount | 273,731 | 254,317 | 256,037
Trademarks |  |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |  |
Indefinite-lived intangibles, gross carrying amount | 63,800 |  | 63,800
Indefinite-lived intangibles, accumulated amortization | 0 |  |
Indefinite lived intangibles, Net carrying amount | 63,800 | 63,800 | 63,800
Customer relationships – retailers |  |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |  |
Finite-lived intangibles, Gross carrying amount | 77,600 | 68,800 | 68,800
Finite-lived intangibles, Accumulated amortization | (42,500) | (35,547) | (33,827)
Finite-lived intangibles, Net carrying amount | $ 35,100 | $ 33,253 | $ 34,973
Finite-lived intangibles, estimated useful life | 10 years | 10 years | 10 years
Customer relationships – e-commerce |  |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |  |
Finite-lived intangibles, Gross carrying amount | $ 3,940 | $ 3,900 | $ 3,900
Finite-lived intangibles, Accumulated amortization | (3,901) | (3,900) | (3,900)
Finite-lived intangibles, Net carrying amount | $ 39 | $ 0 | $ 0
Finite-lived intangibles, estimated useful life | 3 years | 3 years | 3 years
Trademarks |  |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |  |
Finite-lived intangibles, Gross carrying amount | $ 3,500 |  |
Finite-lived intangibles, Accumulated amortization | (29) |  |
Finite-lived intangibles, Net carrying amount | $ 3,471 |  |
Finite-lived intangibles, estimated useful life | 10 years |  |

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- Definition Indefinite-lived Intangible Assets (Excluding Goodwill), Accumulated Amortization + References No definition available. + Details
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- Definition Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross Carrying Amount + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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