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Acquisitions (Details) $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 02, 2019 USD ($) | Mar. 14, 2018 USD ($) | May 08, 2017 USD ($) | Nov. 07, 2016 USD ($) a | Aug. 30, 2017 USD ($) | May 25, 2017 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase price, net of cash acquired | $ 95,000 |  | $ 38,600 | $ 75,000 |  |  | $ 96,777 | $ 11,445 | $ 198,628
Revenues | 37,000 |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  |  |  | $ 36,000 | $ 48,800 |  |  |
Deferred Tax Liabilities, Goodwill |  |  |  |  |  |  | 2,673 | 969 |
Goodwill |  | $ 3,500 | 7,500 | 30,100 | 10,700 | 4,800 | $ 409,215 | $ 381,652 | $ 377,900
Customer contract assets | 2,800 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 28,500 |  |  | 4,800 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings |  |  |  |  | 18,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 59,700 |  | 17,200 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 6,300 | 200 | 9,400 | 16,600 | 300 | 1,700 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  |  |  | $ 15,700 |  |  |  |  |
Area of Land | a |  |  |  | 130,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  |  | 4,100 | $ 7,400 | 1,800 | 2,500 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | 3,500 | 1,100 | 5,100 | 11,000 | 2,100 | 5,200 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capital Lease Obligation |  |  | 8,900 | 2,800 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  | 400 | 9,500 |  | 400 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable | 10,500 | 400 | 4,300 |  | 200 | 4,900 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets | 3,700 | 1,200 | 8,100 |  | $ 3,200 | 35,600 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  | $ 1,500 |  |  |  |  |  |
Customer relationships |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  | $ 32,800 |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 20 years |  |  |  |  |
Mayday Manufacturing Co [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  |  | $ 300 |  |  |  |  |
Morgan Schaffer Inc [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  | $ 3,600 |  |  |
Morgan Schaffer Inc [Member] | Customer Relationships and Developed Technology [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  | 10 years |  |  |
NRG Systems Inc [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 14 years |  |  |  |  |  |
Vanguard Instruments Company [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 15 years |  |  |  |
Manta Test Systems Inc [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | 9,500 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings |  | 3,500 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  | $ 400 |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 13 years |  |  |  |  |  |  |
Globe Composite Solutions, LLC [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Deferred Tax Liabilities, Goodwill | 25,000 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings | 56,700 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | $ 3,500 |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 20 years |  |  |  |  |  |  |  |

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