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Common Shares (Details) | 12 Months Ended
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Apr. 30, 2015 USD ($) Votes Rights yr shares | Apr. 30, 2014 USD ($) shares | Apr. 30, 2013 USD ($) shares
Common shares (Additional Textual) [Abstract] |  |  |
Number of votes each holder of a common share outstanding is entitled | Votes | 1 |  |
Number of votes per share | Votes | 10 |  |
Number of years there has not been a change in beneficial ownership | yr | 4 |  |
Number of votes per share after change in beneficial ownership | Votes | 1 |  |
Number of years required to pass after change in beneficial ownership | yr | 4 |  |
Number of share purchase rights | Rights | 1 |  |
Minimum percentage of outstanding common shares held by persons or group | 10.00% |  |
Number of shares shareholder can purchase at discounted price | 1 |  |
Number of common shares issued for each right as part of exchange option | 1 |  |
Value to redeem per right | $ | $ 0.001 |  |
Shares repurchased during period | 0 | 4,900,000 | 4,000,000
Purchase amount for shares repurchased | $ | $ 0 | $ 495,000,000 | $ 359,400,000
Shares remaining for repurchase | 10,000,000 |  |

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- Definition Common shares. + References No definition available. + Details
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- Definition Minimum percentage of outstanding common shares held by persons or group. + References No definition available. + Details
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- Definition Number of common shares issued for each right, subject to adjustment as part of exchange option. + References No definition available. + Details
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- Definition Number of share purchase rights associated with each outstanding common share. + References No definition available. + Details
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- Definition Number of shares a shareholder can purchase at discounted price for each right. + References No definition available. + Details
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- Definition Number of votes each holder of a common share outstanding is entitled on each matter. + References No definition available. + Details
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- Definition Number of votes per share on specific matters. + References No definition available. + Details
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- Definition Number of votes per share after change in beneficial ownership. + References No definition available. + Details
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- Definition Number of years required to pass after change in beneficial ownership before common share is entitled to more than one vote with respect to that share. + References No definition available. + Details
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- Definition Number of years there has not been a change in beneficial ownership that would allow common shares to be entitled to ten votes per share. + References No definition available. + Details
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- Definition Value to redeem per right. + References No definition available. + Details
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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 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 value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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