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Fair Value Measurement (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Jan. 02, 2016 | Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent consideration related to acquisitions | $ 16,594 |  | $ 19,570
Payment of contingent consideration | 3,100 | $ 1,300 |
Business Combination, Consideration Transferred, Liabilities Incurred | 2,700 |  |
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 | 11,900 |  |
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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