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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 us-gaap_StockRepurchaseProgramAuthorizedAmount1 | [1] |  | $ 200,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Treasury Stock, Value, Acquired, Cost Method | 0 us-gaap_TreasuryStockValueAcquiredCostMethod | 3.5 us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 5,199,699 us-gaap_TreasuryStockSharesAcquired |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 30.00 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |
Treasury Stock, Value, Acquired, Par Value Method |  |  | $ 156,000,000 us-gaap_TreasuryStockValueAcquiredParValueMethod |  | $ 34,100,000 us-gaap_TreasuryStockValueAcquiredParValueMethod |
[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 Amount of stock repurchase plan authorized. + References No definition available. + Details
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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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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: 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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