Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Summary of Recording of Fair Values of Assets Acquired and Liabilities Assumed (Details)

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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