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Acquisitions - Additional Information (Detail) (USD $)
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9 Months Ended | 0 Months Ended | 0 Months Ended | ||||||||
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May 31, 2014
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May 31, 2013
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Aug. 27, 2013
Viking SeaTech
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Aug. 27, 2013
Viking SeaTech
Customer relationships
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May 23, 2014
Hayes Industries [Member]
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May 31, 2014
Hayes Industries [Member]
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May 23, 2014
Hayes Industries [Member]
Customer relationships
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May 23, 2014
Hayes Industries [Member]
Non-compete agreements and other
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Aug. 27, 2013
Tradenames
Viking SeaTech
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May 23, 2014
Tradenames
Hayes Industries [Member]
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May 23, 2014
Patents
Hayes Industries [Member]
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| Business Acquisition [Line Items] | |||||||||||
| Cash paid for business acquisitions, net of cash acquired | $ 30,500,000 | $ 83,000 | $ 235,400,000 | $ 30,500,000 | |||||||
| Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | 4,000,000 | ||||||||||
| Business acquired | 14,987,000 | 87,700,000 | 15,000,000 | ||||||||
| Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill | $ 65,400,000 | $ 40,500,000 | $ 10,600,000 | $ 3,300,000 | $ 300,000 | $ 24,900,000 | $ 2,000,000 | $ 5,000,000 | |||