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Acquisitions - Summary of Recording of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Apr. 28, 2017 | Jul. 31, 2015 | Jun. 30, 2018 | Sep. 30, 2017 | Jun. 24, 2017
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 268,243 | $ 256,275 | $ 230,385
K&H Manufacturing |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets, net of cash and cash equivalents acquired |  | $ 6,052 |  |  |
Land, buildings, improvements and equipment - net |  | 315 |  |  |
Goodwill |  | 11,968 |  |  |
Other assets |  | 0 |  |  |
Other intangible assets - net |  | 29,200 |  |  |
Current liabilities |  | (757) |  |  |
Net assets acquired, less cash and cash equivalents |  | 46,778 |  |  |
Measurement Period Adjustments |  |  |  |  |
Current assets, net of cash and cash equivalents acquired |  | 613 |  |  |
Land, buildings, improvements and equipment - net |  | 0 |  |  |
Goodwill | $ 12,000 | 11,968 |  |  |
Other assets |  | (41,781) |  |  |
Other intangible assets - net | $ 29,200 | 29,200 |  |  |
Current liabilities |  | 0 |  |  |
Net assets acquired, less cash and cash equivalents |  | 0 |  |  |
Amounts Previously Recognized as of Acquisition Date | K&H Manufacturing |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets, net of cash and cash equivalents acquired |  | 5,439 |  |  |
Land, buildings, improvements and equipment - net |  | 315 |  |  |
Goodwill |  | 0 |  |  |
Other assets |  | 41,781 |  |  |
Other intangible assets - net |  | 0 |  |  |
Current liabilities |  | (757) |  |  |
Net assets acquired, less cash and cash equivalents |  | $ 46,778 |  |  |

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