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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Jul. 31, 2018 USD ($) Segment shares | Jul. 31, 2017 USD ($) shares | Jul. 31, 2016 USD ($) shares | Jul. 31, 2015 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of reportable segments | Segment | 2 |  |  |
Cash and cash equivalents | $ 275,249 | $ 223,258 | $ 209,902 | $ 183,478
Depreciation | 38,105 | 34,333 | 24,613 |
Excess liability insurance | 50,000 |  |  |
Advertising costs | $ 26,874 | $ 24,997 | $ 14,472 |
Maximum percentage of tax benefits realized upon ultimate settlement | 50.00% |  |  |
Antidilutive stock options, restricted stock units and unvested restricted stock outstanding | shares | 0 | 0 | 0 |
Trademarks |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets amortization period | 17 years |  |  |
Non-Compete Agreements |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets amortization period | 1 year |  |  |
Any occurrence after March 31,2015 |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Self-insured retention for products liability and personal injury matters | $ 500 |  |  |
Any occurrence after March 31, 2014 and through March 31, 2015 |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Self-insured retention for products liability and personal injury matters | 1,000 |  |  |
Continuing Operations | Selling, General and Administrative Expenses |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Depreciation | $ 5,035 | $ 5,710 | $ 3,812 |
Restricted Stock Units (RSUs) |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Stock-based Compensation, requisite service period | 3 years |  |  |
Minimum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Self-insured retention for products liability and personal injury matters | $ 500 |  |  |
Minimum | Trademarks |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets amortization period | 15 years |  |  |
Minimum | Dealer Network |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets amortization period | 12 years |  |  |
Minimum | Design Technology Assets |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets amortization period | 2 years |  |  |
Minimum | Non-Compete Agreements |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets amortization period | 2 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 |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Cash equivalents maturity period | 3 months | 3 months |  |
Self-insured retention for products liability and personal injury matters | $ 7,500 |  |  |
Maximum | Trademarks |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets amortization period | 25 years |  |  |
Maximum | Dealer Network |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets amortization period | 20 years |  |  |
Maximum | Design Technology Assets |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets amortization period | 15 years |  |  |
Maximum | Non-Compete Agreements |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets amortization period | 15 years |  |  |
Maximum | Backlog |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets amortization period | 3 months |  |  |
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 |  |  |
Held By One Financial Institution |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents | $ 254,701 | $ 211,408 |  |

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