Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Additional Information (Detail)

v2.4.0.8
Acquisitions - Additional Information (Detail) (USD $)
6 Months Ended 0 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Aug. 27, 2013
Viking SeaTech
Aug. 27, 2013
Viking SeaTech
Customer relationships
Aug. 27, 2013
Tradenames
Viking SeaTech
Business Acquisition [Line Items]          
Cash paid for business acquisitions, net of cash acquired $ 0 $ 83,000 $ 235,400,000    
Recognition of goodwill due to acquisitions     87,700,000    
Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill     $ 65,400,000 $ 40,500,000 $ 24,900,000