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Treasury Stock (Details) - Schedule of repurchase of common stock - USD ($) | 1 Months Ended | 12 Months Ended | 56 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 21, 2016 | May 31, 2016 | May 31, 2015 | May 31, 2014 | Sep. 30, 2010 | May 31, 2015 | Feb. 29, 2016 | Dec. 16, 2015 | Jul. 22, 2015 | Oct. 01, 2009
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Authorized stock repurchase amount |  |  |  |  | $ 44,000,000.0 | [1] |  |  | $ 200,000,000 |  | $ 200,000,000
Stock Repurchase Program, Increase in Authorized Amount |  |  |  |  |  |  |  |  |  | $ 50,000,000 |
Amount of stock repurchased in period |  | $ 14,400,000 | $ 3,500,000 | $ 6,200,000 |  |  | $ 48,500,000 |  |  |  |
Remaining authorized repurchase amount |  | $ 45,500,000 |  |  |  |  |  |  |  |  |
Shares of stock repurchased (in shares) |  | 400,000 |  |  | 5,199,699 |  |  |  |  |  |
Average cost of stock repurchased (in Dollars per share) |  | $ 34.75 |  |  | $ 30.00 |  |  |  |  |  |
Total cost of treasury stock acquired |  |  |  |  | $ 156,000,000 |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock, par value per share (in Dollars per share) |  | $ 0.01 | $ 0.01 |  |  |  | $ 0.01 | $ 0.01 |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Authorized repurchase price per share (in Dollars per share) | $ 40,000,000.00 |  |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Authorized repurchase price per share (in Dollars per share) | $ 37,000,000.00 |  |  |  |  |  |  |  |  |  |
[1] | Represents the remainder of a $200.0 authorization after giving effect to the purchase of 5,199,699 shares at $30.00 per sharepursuant to a large share repurchase in the form of a modified Dutch auction tender offer that was completed by the Companyon November 3, 2010 for a total cost of $156.0, excluding related fees and expenses.

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