Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Goodwill (Details)

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Summary of Significant Accounting Policies - Goodwill (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Goodwill          
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 4,600,000     $ 0 $ 2,200,000
Goodwill, Impairment Loss     $ (58,800,000) 0 0
Changes in the carrying amount of goodwill          
Goodwill, Beginning Balance   $ 647,500,000 647,500,000 634,300,000  
Adjustments       (900,000)  
Foreign currency adjustments     (6,800,000) 14,100,000  
Goodwill, Ending Balance     581,900,000 647,500,000 634,300,000
Process Equipment Group          
Goodwill          
Goodwill, Impairment Loss     (58,800,000.0)    
Changes in the carrying amount of goodwill          
Goodwill, Beginning Balance   639,200,000 639,200,000 626,000,000  
Adjustments       (900,000)  
Foreign currency adjustments     (6,800,000) 14,100,000  
Goodwill, Ending Balance     573,600,000 639,200,000 626,000,000
Batesville          
Changes in the carrying amount of goodwill          
Goodwill, Beginning Balance   8,300,000 8,300,000 8,300,000  
Acquisitions     0    
Adjustments       0  
Foreign currency adjustments     0 0  
Goodwill, Ending Balance     8,300,000 $ 8,300,000 $ 8,300,000
Concentration Risk Type [Domain]          
Goodwill          
Goodwill, Impairment Loss   $ 7.4      
Reporting Unit, Approximate Percentage of Fair Value in Excess of Carrying Amount 10.00% 10.00%      
Customer Concentration Risk [Member]          
Changes in the carrying amount of goodwill          
Goodwill, Ending Balance     $ 71,300,000