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Fair Value Measurement (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration related to acquisitions | $ 4,643 |  | $ 8,400 |
Payment of contingent consideration | 3,800 | $ 3,100 |  |
Business Combination, Consideration Transferred, Liabilities Incurred | 3,200 | 2,700 |  |
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration related to acquisitions | 4,643 | 16,594 | $ 8,400 | $ 19,570
Payment of contingent consideration |  | $ 3,050 |  |
Level 3 | Accrued Expenses and Other Current Liabilities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration related to acquisitions | $ 4,600 |  |  |

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