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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, 2017 | Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |  |
Exercise price range floor (in Dollars per share) | $ 25.26 |  |  |
Exercise price range ceiling (in Dollars per share) | $ 44.39 |  |  |
Number of shares | 222,050 |  |  |
25.26-25.49 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |  |
Exercise price range floor (in Dollars per share) | $ 25.26 |  |  |
Exercise price range ceiling (in Dollars per share) | 25.49 |  |  |
26.51-26.92 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |  |
Exercise price range floor (in Dollars per share) | 26.51 |  |  |
Exercise price range ceiling (in Dollars per share) | 26.92 |  |  |
44.39 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |  |
Exercise price range floor (in Dollars per share) | 44.39 |  |  |
Exercise price range ceiling (in Dollars per share) | $ 44.39 |  |  |
Stock Options |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |  |
Number of shares | 222,050 | 291,200 | 401,800 | 712,024
Weighted average exercise price (in Dollars per share) | $ 38.51 | $ 37.46 | $ 36.55 | $ 36.73
Weighted average remaining contractual life (years) | 3 years 5 months 27 days |  |  |
Stock Options | 25.26-25.49 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |  |
Number of shares | 62,350 |  |  |
Weighted average exercise price (in Dollars per share) | $ 25.28 |  |  |
Weighted average remaining contractual life (years) | 2 years 1 month 26 days |  |  |
Stock Options | 26.51-26.92 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |  |
Number of shares | 6,500 |  |  |
Weighted average exercise price (in Dollars per share) | $ 26.73 |  |  |
Weighted average remaining contractual life (years) | 6 months 19 days |  |  |
Stock Options | 44.39 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range |  |  |  |
Number of shares | 153,200 |  |  |
Weighted average exercise price (in Dollars per share) | $ 44.39 |  |  |
Weighted average remaining contractual life (years) | 4 years 2 months 1 day |  |  |

X
- 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=96867065&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=96867065&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=96867065&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=96867065&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=96867065&loc=d3e5070-113901 + Details
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