Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Narrative) (Details)

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Acquisitions (Narrative) (Details) (USD $)
 0 Months Ended 6 Months Ended 12 Months Ended 0 Months Ended
Feb. 10, 2012
Feb. 29, 2012
Feb. 28, 2011
Aug. 31, 2011
Aug. 31, 2011
Tradenames [Member]
Aug. 31, 2011
Patents And Technologies [Member]
Aug. 31, 2011
Customer Relationships [Member]
Aug. 31, 2011
Non-Compete Agreements [Member]
Feb. 10, 2012
Jeyco Pty Ltd [Member]
Dec. 10, 2010
Mastervolt International Holding B.V. [Member]
Jun. 02, 2011
Weasler Engineering, Inc. [Member]
Business Acquisition [Line Items]                      
Deferred purchase price $ 2,200,000                    
Deferred purchase price paid   300,000                  
Number of acquisitions completed       2              
Cash paid for business acquisitions, net of cash acquired   18,907,000 158,533,000           18,600,000 158,200,000 153,200,000
Recognition of goodwill due to acquisitions 12,000,000     153,000,000              
Recognition of intangible assets due to acquisitions 5,500,000     157,500,000 69,900,000 5,500,000 81,500,000 600,000      
Purchase accounting adjustments   (2,719,000)                  
Reduction of initial estimated warranty reserve   7,700,000                  
Transaction costs related to business acquisition activities   $ 700,000 $ 800,000