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Stock-Based Compensation, President and CEO New Hire Equity Awards (Details) $ / shares in Units, $ in Millions | 9 Months Ended
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Jan. 31, 2018 USD ($) Installment $ / shares shares
ELTIP [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Targeted long-term incentive as percentage of base salary | 300.00%
Targeted long-term incentive value | $ | $ 2.7
ELTIP [Member] | Performance Share Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Percentage of targeted long-term incentive value | 60.00%
Grant date fair value (in dollars per share) | $ / shares | $ 59.15
Awards granted (in shares) | shares | 30,916
ELTIP [Member] | Restricted Share Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Percentage of targeted long-term incentive value | 40.00%
Grant date fair value (in dollars per share) | $ / shares | $ 59.15
Awards granted (in shares) | shares | 20,611
ELTIP [Member] | Restricted Share Units [Member] | Vesting on April 30, 2018 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards vesting percentage | 25.00%
ELTIP [Member] | Restricted Share Units [Member] | Vesting on April 30, 2019 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards vesting percentage | 25.00%
ELTIP [Member] | Restricted Share Units [Member] | Vesting on April 30, 2020 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards vesting percentage | 25.00%
ELTIP [Member] | Restricted Share Units [Member] | Vesting on April 30, 2021 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards vesting percentage | 25.00%
Sign-On Grant [Member] | Restricted Share Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Grant date fair value (in dollars per share) | $ / shares | $ 59.15
Awards granted (in shares) | shares | 67,625
Grant value | $ | $ 4.0
Number of equal installments | Installment | 2

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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