Summary of Final Fair Value Assigned to Net Assets Acquired (Detail) - USD ($) $ in Thousands			12 Months Ended
	May. 01, 2014	Aug. 30, 2013	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013	Oct. 31, 2013
Business Acquisition [Line Items]
Goodwill			$ 312,622	$ 256,579	$ 238,103
Total cash consideration for acquisition, less cash acquired			$ 194,486	$ 86,092	$ 10,718
Bison
Business Acquisition [Line Items]
Current assets						$ 4,050
Property, plant and equipment						625
Goodwill						6,660
Current liabilities						(3,761)
Total fair value of net assets acquired						16,914
Bison | Dealer Networks
Business Acquisition [Line Items]
Business acquisition allocated to amortizing intangible asset						7,400
Bison | Trademarks
Business Acquisition [Line Items]
Business acquisition allocated to amortizing intangible asset						1,800
Bison | Backlog
Business Acquisition [Line Items]
Business acquisition allocated to amortizing intangible asset						$ 140
Livin' Lite
Business Acquisition [Line Items]
Cash		$ 247
Other current assets		3,626
Property, plant and equipment		137
Goodwill		9,113
Current liabilities		(2,147)
Total fair value of net assets acquired		17,016
Less cash acquired		(247)
Total cash consideration for acquisition, less cash acquired		16,769
Livin' Lite | Dealer Networks
Business Acquisition [Line Items]
Business acquisition allocated to amortizing intangible asset		3,200
Livin' Lite | Trademarks
Business Acquisition [Line Items]
Business acquisition allocated to amortizing intangible asset		1,500
Livin' Lite | Backlog
Business Acquisition [Line Items]
Business acquisition allocated to amortizing intangible asset		110
Livin' Lite | Design Technology Assets
Business Acquisition [Line Items]
Business acquisition allocated to amortizing intangible asset		1,100
Livin' Lite | Non-Compete Agreements
Business Acquisition [Line Items]
Business acquisition allocated to amortizing intangible asset		$ 130
K.Z. Inc.
Business Acquisition [Line Items]
Cash	$ 996
Other current assets	34,121
Property, plant and equipment	15,057
Goodwill	2,703
Current liabilities	(16,127)
Total fair value of net assets acquired	56,320
Less cash acquired	(996)
Total cash consideration for acquisition, less cash acquired	55,324
K.Z. Inc. | Dealer Networks
Business Acquisition [Line Items]
Business acquisition allocated to amortizing intangible asset	13,160
K.Z. Inc. | Trademarks
Business Acquisition [Line Items]
Business acquisition allocated to amortizing intangible asset	5,540
K.Z. Inc. | Backlog
Business Acquisition [Line Items]
Business acquisition allocated to amortizing intangible asset	420
K.Z. Inc. | Non-Compete Agreements
Business Acquisition [Line Items]
Business acquisition allocated to amortizing intangible asset	$ 450