Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands						12 Months Ended
	May 01, 2015	Jan. 05, 2015	May 01, 2014	Oct. 31, 2013	Aug. 30, 2013	Jul. 31, 2016 USD ($) Segment shares	Jul. 31, 2015 USD ($) shares	Jul. 31, 2014 USD ($) shares	Jul. 31, 2013 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of reportable segments | Segment						2
Cash and cash equivalents						$ 209,902	$ 183,478	$ 289,336	$ 236,601
Depreciation						24,613	15,366	12,850
Excess liability insurance						50,000
Advertising costs						$ 14,472	$ 12,515	$ 9,492
Maximum percentage of tax benefits realized upon ultimate settlement						50.00%
Antidilutive stock options, unvested restricted stock and restricted stock units outstanding | shares						0	0	0
Net current deferred tax assets							$ 59,864
Net long-term deferred income tax liabilities							20,563
Trademarks
Summary Of Significant Accounting Policies [Line Items]
Intangible assets amortization period	15 years	20 years	20 years	20 years	20 years	19 years
Dealer Networks
Summary Of Significant Accounting Policies [Line Items]
Intangible assets amortization period		12 years	12 years	12 years	8 years
Design Technology Assets
Summary Of Significant Accounting Policies [Line Items]
Intangible assets amortization period					5 years
Non-Compete Agreements
Summary Of Significant Accounting Policies [Line Items]
Intangible assets amortization period			5 years		2 years	3 years
Backlog
Summary Of Significant Accounting Policies [Line Items]
Intangible assets amortization period	42 days	42 days	2 months	42 days	42 days	2 months 12 days
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
Reclassification adjustment | ASU 2015-17
Summary Of Significant Accounting Policies [Line Items]
Net current deferred tax assets						67,344
Net long-term deferred income tax liabilities						13,927
Continuing Operations | Selling, General and Administrative Expenses
Summary Of Significant Accounting Policies [Line Items]
Depreciation						$ 3,812	2,362	$ 2,542
Maximum
Summary Of Significant Accounting Policies [Line Items]
Cash equivalents maturity period						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 Networks
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
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 Networks
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 | Backlog
Summary Of Significant Accounting Policies [Line Items]
Intangible assets amortization period						2 months
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
Held By One Financial Institution
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents						$ 164,696	170,231
Held At Various Other Financial Institutions
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents						$ 45,206	$ 13,247