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Income Taxes - Narrative (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 07, 2019 | Jul. 08, 2018 | Jul. 07, 2019 | Jul. 08, 2018 | Sep. 30, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Income tax expense at statutory rate (percent) |  | 25.80% | 28.60% | 25.80% | 28.90% | 24.50%
Effective Income Tax Rate Reconciliation, Percent | [1] | (17.90%) | 26.50% | 18.40% | 46.90% |
[1] | Percentages may not add due to rounding.

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