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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 |  |  |

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