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Treasury Stock (Details) - USD ($) | 3 Months Ended | 12 Months Ended | 60 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2015 | Sep. 30, 2010 | Aug. 31, 2015 | Jul. 22, 2015 | Oct. 01, 2009
Stockholders' Equity Attributable to Parent [Abstract] |  |  |  |  |  |
Authorized stock purchase amount |  | $ 44,000,000 | [1] |  |  | $ 200,000,000
Treasury stock acquired (in shares) |  | 5,199,699 |  |  |  |
Treasury stock acquired (in dollars per sahre) |  | $ 30.00 |  |  |  |
Treasury stock acquired | $ 0 | $ 156,000,000 |  | $ 34,100,000 |  |
Increase in authorized amount of stock to be repurchased |  |  |  |  | $ 50,000,000 |
[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.

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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