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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended | 30 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration related to acquisitions | $ 2,100 |  | $ 2,100 | $ 8,400 |
Payment of contingent consideration | 8,400 | $ 12,100 |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred | 7,800 | 11,100 |  |  |
Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration related to acquisitions | 2,100 | 7,862 | 2,100 | 8,400 | $ 19,570
Payment of contingent consideration | 8,400 | 12,100 |  |  |
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 | 1,100 |  | 1,100 |  |
Level 3 | Other Liabilities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration related to acquisitions | 1,000 |  | 1,000 |  |
Kepware |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration related to acquisitions | 0 |  | 0 |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | 18,000 |  | 18,000 |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low | 16,900 |  | 16,900 |  |
Payment of contingent consideration |  |  | 18,000 |  |
Kepware | Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration related to acquisitions | 0 | 7,862 | $ 0 | $ 8,400 | $ 17,070
Payment of contingent consideration | $ 8,400 | $ 9,600 |  |  |

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