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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Jun. 29, 2019 | Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration related to acquisitions |  |  | $ 1,575 |
Payment of contingent consideration | $ 1,600 | $ 8,400 |  |
Business Combination, Consideration Transferred, Liabilities Incurred | 1,600 | 7,800 |  |
Cost Method Investments | $ 9,400 |  | 1,700 |
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration related to acquisitions |  | 2,100 | $ 1,575 | $ 8,400
Payment of contingent consideration |  | 8,400 |  |
Kepware | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration related to acquisitions |  | 0 |  | $ 8,400
Payment of contingent consideration |  | $ 8,400 |  |

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