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Fair Value Measurement (Narrative) (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Apr. 01, 2017 | Apr. 02, 2016 | Sep. 30, 2016 | Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration related to acquisitions | $ 16,668 |  | $ 19,570 |
Payment of contingent consideration | 3,100 | $ 1,300 |  |
Business Combination, Consideration Transferred, Liabilities Incurred | 2,700 |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration related to acquisitions | 16,668 | 29,190 | $ 19,570 | $ 13,000
Payment of contingent consideration | 3,050 | $ 1,250 |  |
Fair Value, Inputs, Level 3 [Member] | 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 | 12,000 |  |  |
Fair Value, Inputs, Level 3 [Member] | Other Noncurrent Liabilities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration related to acquisitions | $ 4,700 |  |  |

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