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Goodwill and Purchased Intangible Assets - Additional Information (Details) - USD ($)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jul. 01, 2021
Jul. 01, 2020
Acquired Finite Lived Intangible Assets [Line Items]        
Minimum weighted-average cost of capital (as a percent)     8.50% 8.00%
Maximum weighted-average cost of capital (as a percent)     13.00% 13.50%
Terminal growth rate (as a percent)     3.00% 3.00%
Weighted- Average Life (in years) 14 years 4 months 24 days 14 years 8 months 12 days    
Net $ 49,700,000 $ 33,500,000    
2022 11,000,000.0      
2023 7,200,000      
2024 4,300,000      
2025 4,200,000      
2026 $ 4,200,000      
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 $ 20,300,000 $ 21,600,000    
JLG Industries Inc And Its Wholly Owned Subsidiaries        
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)     85.00%  
Goodwill impairment loss 0      
impairment of indefinite-lived intangible assets $ 0      
Pierce | Distribution network        
Acquired Finite Lived Intangible Assets [Line Items]        
Weighted- Average Life (in years) 40 years      
Net $ 19,800,000