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Receivables and Concentration of Credit Risk (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 04, 2021 | Sep. 30, 2020
Receivables [Line Items] |  |
Allowance for uncollectible receivables | $ 6.6 | $ 6.4
Two Customers | Trade Receivables | Customer Concentration Risk |  |
Receivables [Line Items] |  |
Concentration risk (as a percent) | 27.30% | 28.40%

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