Treasury Stock (Details) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended		51 Months Ended
	Feb. 28, 2015	Feb. 28, 2015	Sep. 30, 2010		Nov. 30, 2014	Oct. 01, 2009
Disclosure Text Block Supplement [Abstract]
Stock Repurchase Program, Authorized Amount			$ 44,000,000	[1]		$ 200,000,000
Treasury Stock, Value, Acquired, Cost Method	0	3.5
Treasury Stock, Shares, Acquired			5,199,699
Treasury Stock Acquired, Average Cost Per Share			$ 30.00
Treasury Stock, Value, Acquired, Par Value Method			$ 156,000,000		$ 34,100,000

[1] Represents the remainder of a $200.0 authorization after giving effect to the purchase of 5,199,699 shares at $30.00 per share pursuant to a large share repurchase in the form of a modified Dutch auction tender offer that was completed by the Company on November 3, 2010 for a total cost of $156.0 , excluding related fees and expenses.