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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Narrative) (Details) - $ / shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 01, 2018 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017
Debt Instrument [Line Items] |  |  |  |
Earnings per share - basic | $ 0.62 | $ 0.48 | $ 2.69 | $ 1.44
Accounting Standards Update 2016-09 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Earnings per share - basic | $ 0.00 |  | $ 0 |

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