Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidating Statements of Cash Flows (Parenthetical) (Detail)

v2.4.0.6
Condensed Consolidating Statements of Cash Flows (Parenthetical) (Detail)
May 31, 2012
2% Convertible Notes
Aug. 31, 2011
2% Convertible Notes
May 31, 2011
2% Convertible Notes
Nov. 30, 2003
2% Convertible Notes
May 31, 2012
5.625% Senior Notes
Apr. 16, 2012
5.625% Senior Notes
May 31, 2012
6.875% Senior Notes
Aug. 31, 2011
6.875% Senior Notes
Guarantor Obligations [Line Items]                
Debt instrument, interest rate 2.00% 2.00% 2.00% 2.00% 5.625% 5.625% 6.875% 6.875%