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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Jul. 31, 2021 USD ($) | Jul. 31, 2021 USD ($) | Jul. 31, 2021 USD ($) Segment | Jul. 31, 2021 USD ($) | Jul. 31, 2021 USD ($) shares | Jul. 31, 2021 USD ($) segment | Jul. 31, 2020 USD ($) shares | Jul. 31, 2019 USD ($) shares
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of reportable segments |  |  | 3 |  |  | 3 |  |
Cash and cash equivalents | $ 445,852 | $ 445,852 | $ 445,852 | $ 445,852 | $ 445,852 | $ 445,852 | $ 538,519 | $ 425,615
Depreciation |  | 113,398 |  |  |  |  | 98,933 | 73,139
Advertising costs |  | 44,638 |  |  |  |  | $ 67,019 | $ 38,643
Maximum percentage of tax benefits realized upon ultimate settlement |  |  |  | 50.00% |  |  |  |
Stock-based compensation, requisite service period | 3 years |  |  |  |  |  |  |
Restricted Stock Units (RSUs) and Performance Stock Units (PSUs) |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Antidilutive restricted stock units and unvested restricted stock outstanding (in shares) | shares |  |  |  |  | 0 |  | 0 | 233,395
Research and Development Expense |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Research and development expense |  | 26,775 |  |  |  |  | $ 19,123 | $ 9,381
Continuing Operations | Selling, General and Administrative Expenses |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Depreciation |  | 22,409 |  |  |  |  | 15,060 | $ 8,350
Backlog |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life | 9 months |  |  |  |  |  |  |
Rental vehicles |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful life | 6 years |  |  |  |  |  |  |
Minimum | Non-compete agreements |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life | 2 years |  |  |  |  |  |  |
Minimum | Trademarks |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life | 15 years |  |  |  |  |  |  |
Minimum | Dealer network |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life | 12 years |  |  |  |  |  |  |
Minimum | Building and Building Improvements |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful life | 10 years |  |  |  |  |  |  |
Minimum | Machinery and equipment |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful life | 3 years |  |  |  |  |  |  |
Maximum | Non-compete agreements |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life | 15 years |  |  |  |  |  |  |
Maximum | Trademarks |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life | 25 years |  |  |  |  |  |  |
Maximum | Dealer network |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life | 20 years |  |  |  |  |  |  |
Maximum | Building and Building Improvements |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful life | 39 years |  |  |  |  |  |  |
Maximum | Machinery and equipment |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful life | 10 years |  |  |  |  |  |  |
Euro Financial Institutions One |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 111,215 | 111,215 | 111,215 | $ 111,215 | $ 111,215 | 111,215 | 174,077 |
Euro Financial Institutions Two |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents | 27,926 | 27,926 | 27,926 | 27,926 | 27,926 | 27,926 | 49,732 |
Held By One U.S. Financial Institution |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 260,101 | $ 260,101 | $ 260,101 | $ 260,101 | $ 260,101 | $ 260,101 | $ 260,876 |

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