Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Subsequent Events (Details)

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Subsequent Events (Details) - USD ($)
Feb. 28, 2017
Jan. 31, 2017
Nov. 30, 2016
Aug. 31, 2016
May 31, 2016
Feb. 29, 2016
May 31, 2015
Feb. 28, 2015
Subsequent Event [Line Items]                
Share repurchase program, authorized amount     $ 250,000,000 $ 250,000,000 $ 250,000,000 $ 400,000,000 $ 750,000,000 $ 250,000,000
Subsequent Event [Member]                
Subsequent Event [Line Items]                
Share repurchase program, authorized amount $ 350,000,000              
January 2017 Notes [Member] | Subsequent Event [Member]                
Subsequent Event [Line Items]                
Face amount   $ 600,000,000            
Stated interest rate   3.50%