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SHAREHOLDERS' EQUITY Share Repurchase Program (Details) (USD $) In Millions, except Share data | 3 Months Ended
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Jul. 31, 2011
Equity, Class of Treasury Stock [Line Items] |
Stock Repurchase Program, Authorized Amount | $ 150.0
Stock Repurchased and Retired During Period, Shares | 1,527,196
Stock Repurchased and Retired During Period, Value | 34.1
Repurchase of Equity [Member] |
Equity, Class of Treasury Stock [Line Items] |
Maximum Broker Authorization to Purchase on Our Behalf | 40.0
Stock Repurchased and Retired Subsequent to Period End, Shares | 1,598,500
Stock Repurchased and Retired Subsequent to Period End, Value | $ 31.0

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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 4: 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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