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Goodwill and Purchased Intangible Assets - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jul. 01, 2020
Jul. 01, 2019
Acquired Finite Lived Intangible Assets [Line Items]        
Minimum weighted-average cost of capital (as a percent)     8.00% 9.50%
Maximum weighted-average cost of capital (as a percent)     13.50% 13.00%
Terminal growth rate (as a percent)     3.00% 3.00%
Weighted- Average Life (in years) 14 years 8 months 12 days 14 years 8 months 12 days    
Net $ 33.5 $ 44.6    
2021 5.3      
2022 4.8      
2023 3.4      
2024 1.6      
2025 $ 1.5      
Distribution network        
Acquired Finite Lived Intangible Assets [Line Items]        
Weighted- Average Life (in years) 39 years 1 month 6 days 39 years 1 month 6 days    
Net $ 21.6 $ 23.1    
JLG Industries Inc And Its Wholly Owned Subsidiaries Member        
Acquired Finite Lived Intangible Assets [Line Items]        
Percentage of recorded goodwill and purchased intangibles concentrated within the JLG reporting unit in the access equipment segment (as a percent)     90.00%  
Pierce | Distribution network        
Acquired Finite Lived Intangible Assets [Line Items]        
Weighted- Average Life (in years) 40 years      
Net $ 21.2