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Acquisitions (Details) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 09, 2023 | Feb. 01, 2023 | Nov. 04, 2021 | Jun. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Acquisitions |  |  |  |  |  |  |  |  |
Payments to acquire businesses net of cash acquired |  |  |  |  |  |  | $ 56,383 | $ 17,694 | $ 10,906
Goodwill | $ 30,600 |  |  |  |  |  |  |  |
Working capital settlement |  |  |  |  | $ 200 |  |  |  |
Goodwill |  |  |  |  |  | $ 539,899 | 539,899 | 503,177 | 492,700
Revenues |  |  |  |  |  |  | 1,026,759 | 956,033 | $ 857,502
Goodwill, tax deductible expenses |  |  |  |  |  | 15,416 | $ 15,416 | $ 13,313 |
MPE Limited (MPE) |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
Payments to acquire businesses net of cash acquired | 56,200 |  |  |  |  |  |  |  |
Fair value of accounts receivable acquired | 400 |  |  |  |  |  |  |  |
Fair value of inventory acquired | 1,100 |  |  |  |  |  |  |  |
Fair value of property, plant and equipment acquired | 1,700 |  |  |  |  |  |  |  |
Fair value of accounts payable and accrued expenses acquired | 700 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities | 8,100 |  |  |  |  |  |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed finite-lived intangibles | 29,100 |  |  |  |  |  |  |  |
Working capital settlement |  |  |  | $ 200 |  |  |  |  |
Revenues |  |  |  |  |  | $ 10,000 |  |  |
CMT Materials, LLC and its affiliate Engineered Syntactic Systems, LLC |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
Payments to acquire businesses net of cash acquired |  | $ 18,000 |  |  |  |  |  |  |
Fair value of accounts receivable acquired |  | 1,700 |  |  |  |  |  |  |
Fair value of inventory acquired |  | 3,000 |  |  |  |  |  |  |
Fair value of property, plant and equipment acquired |  | 1,300 |  |  |  |  |  |  |
Fair value of accounts payable and accrued expenses acquired |  | 1,200 |  |  |  |  |  |  |
Fair value of identifiable intangible assets acquired |  | 7,300 |  |  |  |  |  |  |
Goodwill |  | 5,600 |  |  |  |  |  |  |
Networks electronic company |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
Payments to acquire businesses net of cash acquired |  |  | $ 15,400 |  |  |  |  |  |
Fair value of accounts receivable acquired |  |  | 600 |  |  |  |  |  |
Fair value of inventory acquired |  |  | 1,500 |  |  |  |  |  |
Fair value of property, plant and equipment acquired |  |  | 200 |  |  |  |  |  |
Fair value of identifiable intangible assets acquired |  |  | 8,100 |  |  |  |  |  |
Goodwill |  |  | 5,600 |  |  |  |  |  |
Goodwill |  |  | 5,700 |  |  |  |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed current liabilities accounts payable |  |  | 700 |  |  |  |  |  |
Customer Relationships | MPE Limited (MPE) |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
Fair value of identifiable intangible assets acquired | $ 31,100 |  |  |  |  |  |  |  |
Customer Relationships | CMT Materials, LLC and its affiliate Engineered Syntactic Systems, LLC |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed finite-lived intangibles |  | $ 6,200 |  |  |  |  |  |  |
Customer Relationships | Networks electronic company |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |
Business combination recognized identifiable assets acquired and liabilities assumed indefinite-lived intangible assets |  |  | $ 6,300 |  |  |  |  |  |

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