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Restructuring and Other Charges - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | $ 200,000 | $ 10,200,000 | $ 3,100,000 | $ 10,200,000
Other Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  | 500,000 |
Access Equipment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 200,000 | 7,600,000 | 3,400,000 | 7,600,000
Commercial |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  | 1,500,000 | 100,000 | 1,500,000
Access Equipment Restructuring Plan 1 | Access Equipment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 200,000 | 7,600,000 | 3,400,000 | 7,600,000
Access Equipment Restructuring Plan 1 | Access Equipment | Restructuring Related Charges |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 1,100,000 |  | 8,100,000 |
Access Equipment Restructuring Plan 1 | Access Equipment | Accelerated Depreciation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  | 2,800,000 |
Access Equipment Restructuring Plan 1 | Access Equipment | Inventory Obsolescence |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 700,000 |  | 4,500,000 |
Access Equipment Restructuring Plan 1 | Access Equipment | Other Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 400,000 |  | 800,000 |
Commercial Restructuring Plan | Commercial |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | $ 0 | $ 1,500,000 | $ 100,000 | $ 1,500,000

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