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Acquisitions (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 09, 2021 | Jul. 29, 2021 | Sep. 30, 2021 | Sep. 30, 2019 | Sep. 30, 2020
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire businesses net of cash acquired |  |  | $ 168,903 | $ 95,840 |
Goodwill |  |  | 504,853 | $ 390,300 | $ 408,063
Goodwill, tax deductible expenses |  |  | $ 13,746 |  | $ 7,878
Altanova Group |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire businesses net of cash acquired |  | $ 115,000 |  |  |
Goodwill |  | 71,900 |  |  |
Business combination contingent consideration liability |  | 6,900 |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed, property, plant and equipment |  | 1,200 |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed deferred tax liabilities |  | 16,400 |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed current assets receivables |  | 9,700 |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed inventory |  | 5,600 |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed other noncurrent assets |  | 8,000 |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed current liabilities accounts payable |  | $ 12,800 |  |  |
Altanova Group | Customer relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired finite-lived intangible assets weighted average useful life |  | 20 years |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed indefinite-lived intangible assets |  | $ 50,500 |  |  |
Altanova Group | Trade Names |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired finite-lived intangible assets weighted average useful life |  | 10 years |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed indefinite-lived intangible assets |  | $ 4,300 |  |  |
Phenix Technologies |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire businesses net of cash acquired | $ 47,200 |  |  |  |
Goodwill | 23,200 |  |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed, property, plant and equipment | 8,000 |  |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed current assets receivables | 2,600 |  |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed inventory | 5,800 |  |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed current liabilities accounts payable | 6,200 |  |  |  |
Goodwill, tax deductible expenses | $ 20,000 |  |  |  |
Phenix Technologies | Customer relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired finite-lived intangible assets weighted average useful life | 13 years |  |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed indefinite-lived intangible assets | $ 9,600 |  |  |  |
Phenix Technologies | Customer Relationships and Developed Technology |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed indefinite-lived intangible assets | 500 |  |  |  |
Phenix Technologies | Trade Names |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed indefinite-lived intangible assets | $ 3,700 |  |  |  |

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