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Shareholders' Equity (Details) - USD ($)
 12 Months Ended
Jun. 16, 2015
Apr. 14, 2015
Apr. 10, 2015
Oct. 07, 2013
May. 31, 2015
May. 31, 2014
May. 31, 2013
Equity, Class of Treasury Stock [Line Items]              
Stock repurchase program, authorized amount         $ 302,300,000    
Stock repurchase program, remaining authorized repurchase amount         $ 102,900,000    
ASR program, authorized amount     $ 100,000,000 $ 100,000,000     $ 125,000,000
Stock repurchase program, estimated stock repurchase and retirement, in next period       $ 100,000,000.0      
Repurchase of common stock (in shares)   1,630,988   3,200,000 1,955,730   5,000,000
Stock repurchased and retired, value         $ 369,082,000 $ 455,046,000 $ 175,349,000
Accelerated share repurchases, final price paid per share       $ 30.48 $ 51.13   $ 24.57
Other Than Accelerated Share Repurchase Program              
Equity, Class of Treasury Stock [Line Items]              
Repurchase of common stock (in shares)         7,000,000 12,400,000 2,200,000
Stock repurchased and retired, value         $ 269,000,000 $ 355,000,000 $ 50,300,000
Treasury stock acquired, average cost per share (in dollars per share)         $ 38.19 $ 28.65 $ 22.28
Subsequent Event              
Equity, Class of Treasury Stock [Line Items]              
Repurchase of common stock (in shares) 324,742