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Acquisitions - Additional Information (Detail) (USD $)
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12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | ||||||||||||||||
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Aug. 31, 2014
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Aug. 31, 2013
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Aug. 31, 2012
acquisition
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Aug. 27, 2013
Viking
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May 23, 2014
Hayes Industries
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Aug. 31, 2014
Hayes Industries
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Aug. 31, 2013
Engineered Solutions
Entity
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Jul. 20, 2012
CrossControl
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Mar. 28, 2012
Turotest
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Feb. 10, 2012
Jeyco
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Aug. 31, 2012
Technology-Based Intangible Assets [Member]
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Aug. 31, 2012
Customer Relationships
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Aug. 27, 2013
Customer Relationships
Viking
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May 23, 2014
Customer Relationships
Hayes Industries
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Aug. 31, 2012
Non-compete Agreements
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May 23, 2014
Non-compete Agreements
Hayes Industries
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May 23, 2014
Patents
Hayes Industries
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Aug. 31, 2012
Trade Names
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May 23, 2014
Trade Names
Hayes Industries
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Aug. 27, 2013
Trade Names
Viking
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| Business Acquisition [Line Items] | ||||||||||||||||||||
| Transaction costs related to business acquisition activities | $ 500,000 | $ 3,700,000 | $ 1,400,000 | |||||||||||||||||
| Reductions in goodwill due to purchase price | 835,000 | (17,000) | ||||||||||||||||||
| Business Acquisition, Date of Acquisition Agreement | Aug. 27, 2013 | May 23, 2014 | Jul. 20, 2012 | Mar. 28, 2012 | Feb. 10, 2012 | |||||||||||||||
| Cash paid for business acquisitions, net of cash acquired | 30,500,000 | 235,489,000 | 69,309,000 | 235,500,000 | 30,500,000 | 40,600,000 | 8,100,000 | 20,700,000 | ||||||||||||
| Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | 4,000,000 | |||||||||||||||||||
| Recognition of Goodwill due to Business acquired | 17,536,000 | 87,734,000 | 40,100,000 | 86,900,000 | 17,536,000 | |||||||||||||||
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 32,800,000 | 65,400,000 | 10,550,000 | 2,200,000 | 24,200,000 | 40,500,000 | 3,300,000 | 700,000 | 250,000 | 5,000,000 | 5,700,000 | 2,000,000 | 24,900,000 | |||||||
| Number of tuck-in acquisitions | 2 | |||||||||||||||||||
| Number of businesses acquired | 3 | |||||||||||||||||||
| Deferred purchase price for business acquisitions | $ 5,300,000 | |||||||||||||||||||