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Preferred and Common Stock - Schedule of Shares Outstanding and Weighted-Average Remaining Contractual Life by Exercise Range (Details) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |  |
Exercise price range floor | $ 20.68 |  |  |
Exercise price range ceiling | $ 44.39 |  |  |
Number of shares | 401,800 |  |  |
20.68 - 24.11 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |  |
Exercise price range floor | $ 20.68 |  |  |
Exercise price range ceiling | 24.11 |  |  |
25.26 - 26.92 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |  |
Exercise price range floor | 25.26 |  |  |
Exercise price range ceiling | 26.92 |  |  |
44.39 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |  |
Exercise price range floor | 44.39 |  |  |
Exercise price range ceiling | $ 44.39 |  |  |
Stock Options |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |  |
Number of shares | 401,800 | 712,024 | 854,809 | 1,053,509
Weighted average exercise price | $ 36.55 | $ 36.73 | $ 34.64 | $ 32.59
Weighted average remaining contractual life (years) | 5 years 1 month 17 days |  |  |
Stock Options | 20.68 - 24.11 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |  |
Number of shares | 7,000 |  |  |
Weighted average exercise price | $ 22.62 |  |  |
Weighted average remaining contractual life (years) | 1 year 2 months 12 days |  |  |
Stock Options | 25.26 - 26.92 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |  |
Number of shares | 159,600 |  |  |
Weighted average exercise price | $ 25.61 |  |  |
Weighted average remaining contractual life (years) | 3 years 9 months 18 days |  |  |
Stock Options | 44.39 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |  |
Number of shares | 235,200 |  |  |
Weighted average exercise price | $ 44.39 |  |  |
Weighted average remaining contractual life (years) | 6 years 2 months 12 days |  |  |

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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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