Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Additional Information (Detail)

v2.4.0.8
Fair Value Measurements - Additional Information (Detail) (5.625% Senior Notes, Senior Notes, USD $)
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Apr. 16, 2012
5.625% Senior Notes | Senior Notes
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Face amount $ 300,000,000     $ 300,000,000.0
Debt instrument, interest rate 5.625% 5.625% 5.625% 5.625%
Fair value of long-term debt $ 315,800,000 $ 300,800,000