Quarterly report pursuant to Section 13 or 15(d)

Guarantor Subsidiaries - Additional Information (Detail)

v2.4.0.6
Guarantor Subsidiaries - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2012
5.625% Senior Notes
Aug. 31, 2012
5.625% Senior Notes
Apr. 16, 2012
5.625% Senior Notes
Guarantor Obligations [Line Items]          
Issuance of Senior Notes     $ 300,000 $ 300,000 $ 300,000
Debt instrument, interest rate 2.00% 2.00% 5.625% 5.625% 5.625%