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Shareholders' Equity - Summary of Stock Option Activity and Related Information for Stock Options Granted, Options Outstanding and Exercisable (Details) - Stock Options | 12 Months Ended
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Apr. 30, 2016 $ / shares shares
2010 Stock Plan |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options outstanding (in shares) | shares | 197,332
Options outstanding - exercise price (in dollars per share) | $ / shares | $ 24.55
Options exercisable (in shares) | shares | 85,332
Options exercisable - exercise price (in dollars per share) | $ / shares | $ 17.46
2010 Stock Plan | $10.55 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options outstanding (in shares) | shares | 5,333
Options outstanding - exercise price (in dollars per share) | $ / shares | $ 10.70
Options outstanding - avg remaining life | 5 years 3 months 9 days
Options exercisable (in shares) | shares | 5,333
Options exercisable - exercise price (in dollars per share) | $ / shares | $ 10.70
Options exercisable - avg. remaining life | 5 years 3 months 9 days
2010 Stock Plan | $8.64 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options outstanding (in shares) | shares | 30,666
Options outstanding - exercise price (in dollars per share) | $ / shares | $ 8.64
Options outstanding - avg remaining life | 6 years 3 months 4 days
Options exercisable (in shares) | shares | 30,666
Options exercisable - exercise price (in dollars per share) | $ / shares | $ 8.64
Options exercisable - avg. remaining life | 6 years 3 months 4 days
2010 Stock Plan | $17.27 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options outstanding (in shares) | shares | 73,333
Options outstanding - exercise price (in dollars per share) | $ / shares | $ 17.27
Options outstanding - avg remaining life | 7 years 3 months 8 days
Options exercisable (in shares) | shares | 33,333
Options exercisable - exercise price (in dollars per share) | $ / shares | $ 17.27
Options exercisable - avg. remaining life | 7 years 3 months 8 days
2010 Stock Plan | $37.01 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options outstanding (in shares) | shares | 88,000
Options outstanding - exercise price (in dollars per share) | $ / shares | $ 37.01
Options outstanding - avg remaining life | 8 years 3 months 20 days
Options exercisable (in shares) | shares | 16,000
Options exercisable - exercise price (in dollars per share) | $ / shares | $ 37.01
Options exercisable - avg. remaining life | 8 years 3 months 20 days
2007 Stock Plan |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options outstanding (in shares) | shares | 79,666
Options outstanding - exercise price (in dollars per share) | $ / shares | $ 28.91
Options exercisable (in shares) | shares | 31,833
Options exercisable - exercise price (in dollars per share) | $ / shares | $ 25.52
2007 Stock Plan | $10.55 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options outstanding (in shares) | shares | 5,000
Options outstanding - exercise price (in dollars per share) | $ / shares | $ 10.55
Options outstanding - avg remaining life | 4 years 3 months 5 days
Options exercisable (in shares) | shares | 5,000
Options exercisable - exercise price (in dollars per share) | $ / shares | $ 10.55
Options exercisable - avg. remaining life | 4 years 3 months 5 days
2007 Stock Plan | $8.64 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options outstanding (in shares) | shares | 4,166
Options outstanding - exercise price (in dollars per share) | $ / shares | $ 8.64
Options outstanding - avg remaining life | 6 years 3 months 4 days
Options exercisable (in shares) | shares | 4,166
Options exercisable - exercise price (in dollars per share) | $ / shares | $ 8.64
Options exercisable - avg. remaining life | 6 years 3 months 4 days
2007 Stock Plan | $17.27 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options outstanding (in shares) | shares | 20,000
Options outstanding - exercise price (in dollars per share) | $ / shares | $ 17.27
Options outstanding - avg remaining life | 7 years 3 months 8 days
Options exercisable (in shares) | shares | 5,834
Options exercisable - exercise price (in dollars per share) | $ / shares | $ 17.27
Options exercisable - avg. remaining life | 7 years 3 months 8 days
2007 Stock Plan | $37.01 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options outstanding (in shares) | shares | 50,500
Options outstanding - exercise price (in dollars per share) | $ / shares | $ 37.01
Options outstanding - avg remaining life | 8 years 3 months 20 days
Options exercisable (in shares) | shares | 16,833
Options exercisable - exercise price (in dollars per share) | $ / shares | $ 37.01
Options exercisable - avg. remaining life | 8 years 3 months 20 days

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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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