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Acquisitions - Additional Information (Detail) (USD $)
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9 Months Ended | 12 Months Ended | 1 Months Ended | |||||||||
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May 31, 2012
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May 31, 2011
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Aug. 31, 2011
Entity
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Jun. 02, 2011
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Jun. 02, 2011
Weasler Engineering, Inc.
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Dec. 10, 2010
Mastervolt International Holding B.V.
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Mar. 28, 2012
Turotest
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Feb. 10, 2012
Jeyco
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Aug. 31, 2011
Customer Relationships
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Aug. 31, 2011
Tradenames
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Aug. 31, 2011
Patents and Technologies
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Aug. 31, 2011
Non-compete Agreements
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| Business Acquisition [Line Items] | ||||||||||||
| Cash paid for business acquisitions, net of cash acquired | $ 29,734,000 | $ 160,047,000 | $ 153,200,000 | $ 158,200,000 | $ 8,100,000 | $ 20,700,000 | ||||||
| Deferred purchase price for business acquisitions | 5,300,000 | |||||||||||
| Recognition of goodwill due to acquisitions | 152,400,000 | 5,500,000 | 14,100,000 | |||||||||
| Recognition of intangible assets due to acquisitions | 157,500,000 | 7,000,000 | 5,500,000 | 81,500,000 | 69,900,000 | 5,500,000 | 600,000 | |||||
| Number of acquisitions completed | 2 | |||||||||||
| Purchase accounting adjustments | (3,280,000) | |||||||||||
| Reduction in initial estimated warranty reserve | 7,700,000 | |||||||||||
| Deferred purchase price paid | 900,000 | |||||||||||
| Transaction costs related to business acquisition activities | $ 1,000,000 | $ 900,000 | ||||||||||