Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Additional Information (Detail)

v2.4.0.8
Acquisitions - Additional Information (Detail) (USD $)
3 Months Ended 0 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Aug. 27, 2013
Viking SeaTech
Aug. 27, 2013
Viking SeaTech
Customer relationships
Aug. 27, 2013
Tradenames
Viking SeaTech
Business Acquisition [Line Items]          
Acquisition related costs $ 100,000 $ 100,000      
Deferred purchase price for business acquisitions 400,000        
Cash paid for business acquisitions, net of cash acquired 0 83,000 235,400,000    
Recognition of goodwill due to acquisitions     87,800,000    
Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill     $ 65,400,000 $ 40,500,000 $ 24,900,000