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Other Intangible Assets - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended | 15 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 30, 2019 USD ($) customer | Dec. 24, 2016 USD ($) | Sep. 28, 2019 USD ($) | Sep. 29, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Feb. 28, 2019 | Feb. 01, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Number of retail customers that exited | customer | 1 |  |  |  |  |  |  |
Amortization expense for intangibles |  |  | $ 14.5 | $ 12.7 | $ 8.8 |  |  |
Estimated annual amortization expense related to acquired intangible assets, 2020 |  |  | 12.0 |  |  |  |  |
Estimated annual amortization expense related to acquired intangible assets, 2021 |  |  | 12.0 |  |  |  |  |
Estimated annual amortization expense related to acquired intangible assets, 2022 |  |  | 12.0 |  |  |  |  |
Estimated annual amortization expense related to acquired intangible assets, 2023 |  |  | 12.0 |  |  |  |  |
Estimated annual amortization expense related to acquired intangible assets, 2024 |  |  | 12.0 |  |  |  |  |
Pet Segment |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Impairment charge |  |  | $ 2.5 |  |  |  |  |
Minimum |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Useful life |  |  | 3 years |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Useful life |  |  | 25 years |  |  |  |  |
Marketing-Related Intangible Assets |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Other intangible assets, net | $ 1.0 |  |  |  |  |  |  |
Marketing-Related Intangible Assets | Weighted Average |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Useful life |  |  | 4 years |  |  |  |  |
Customer-Related Intangible Assets |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Other intangible assets, net | $ 9.9 |  |  |  |  |  |  |
Customer-Related Intangible Assets | Weighted Average |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Useful life |  |  | 9 years |  |  |  |  |
Other Acquired Intangible Assets | Weighted Average |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Useful life |  |  | 10 years |  |  |  |  |
K&H, Bell Nursery, and General Pet Supply | Marketing-Related Intangible Assets |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Other intangible assets, net |  |  |  |  |  | $ 9.6 |  |
K&H, Bell Nursery, and General Pet Supply | Customer-Related Intangible Assets |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Other intangible assets, net |  |  |  |  |  | 36.7 |  |
K&H, Bell Nursery, and General Pet Supply | Other Acquired Intangible Assets |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Other intangible assets, net |  |  |  |  |  | $ 3.3 |  |
Segrest Inc. | Marketing-Related Intangible Assets |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Other intangible assets, net |  | $ 2.0 |  |  |  |  |  |
Segrest Inc. | Customer-Related Intangible Assets |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Other intangible assets, net |  | 27.3 |  |  |  |  |  |
Segrest Inc. | Other Acquired Intangible Assets |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Other intangible assets, net |  | $ 1.3 |  |  |  |  |  |
Arden Companies |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Percent of investment purchased | 55.00% |  |  |  |  |  | 55.00% | 55.00%

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