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Transactions with Related Parties (Details) - Contract Packaging, Inc. - USD ($) $ in Millions | 12 Months Ended
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Sep. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Related Party Transaction [Line Items] |  |  |
Percentage of shares held by CPI in Tech Pac | 20.00% | 20.00% | 20.00%
Amount due to related party | $ 0.9 | $ 0.3 |
Tech Pac |  |  |
Related Party Transaction [Line Items] |  |  |
Purchases products from related party | $ 31.3 | $ 32.5 | $ 51.1

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