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Acquisition - Erwin Hymer Group - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 01, 2019 | Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019 | Jul. 31, 2019 | Jul. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill, purchase accounting adjustments |  |  |  | $ 5,087 |  |  |
Goodwill |  | $ 1,353,120 | $ 377,693 | 1,353,120 | $ 377,693 | $ 1,358,032 | $ 377,693
Acquisition-related costs |  | 0 | 42,059 | $ 0 | 99,148 |  |
Other Expense |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition-related costs |  |  | 10,907 |  | 25,441 |  |
Trademarks |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average remaining life |  |  |  | 17 years |  |  |
Erwin Hymer Group |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill, purchase accounting adjustments |  |  |  | $ 5,087 |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 17 years |  |  |  |  |  |
Goodwill | $ 1,013,559 |  |  |  |  |  |
Business acquisition, goodwill, expected tax deductible amount | $ 242,000 |  |  |  |  |  |
Erwin Hymer Group | Acquisition costs |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition-related costs |  | $ 42,059 | 42,059 | $ 99,148 | 99,148 |  |
Erwin Hymer Group | Foreign Currency Contract Losses | Acquisition costs |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition-related costs |  |  | $ 31,152 |  | $ 73,707 |  |
Erwin Hymer Group | Trademarks |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Finite-lived intangible assets, amortization method | 20 years |  |  |  |  |  |
Erwin Hymer Group | Technology assets |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Finite-lived intangible assets, amortization method | 10 years |  |  |  |  |  |
Erwin Hymer Group | Dealer network |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Finite-lived intangible assets, amortization method | 20 years |  |  |  |  |  |
Erwin Hymer Group | Backlog |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average remaining life | 5 months |  |  |  |  |  |

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