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Stock-Based Compensation, Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Options (in shares) | 611 |  |  |
Options Outstanding, Weighted Average Remaining Term | 3 years 3 months 18 days |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 48.88 |  |  |
Options Exercisable, Number of Options (in shares) | 530 |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 47.43 |  |  |
$35.04 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Upper Range Limit (in dollars per share) | $ 35.04 |  |  |
Options Outstanding, Number of Options (in shares) | 11 |  |  |
Options Outstanding, Weighted Average Remaining Term | 1 year 2 months 12 days |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 35.04 |  |  |
Options Exercisable, Number of Options (in shares) | 11 |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 35.04 |  |  |
$39.53 to $40.02 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Lower Range Limit (in dollars per share) | 39.53 |  |  |
Range of Exercise Prices, Upper Range Limit (in dollars per share) | $ 40.02 |  |  |
Options Outstanding, Number of Options (in shares) | 226 |  |  |
Options Outstanding, Weighted Average Remaining Term | 3 years 1 month 6 days |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 39.62 |  |  |
Options Exercisable, Number of Options (in shares) | 226 |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 39.62 |  |  |
$47.55 to $49.55 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Lower Range Limit (in dollars per share) | 47.55 |  |  |
Range of Exercise Prices, Upper Range Limit (in dollars per share) | $ 49.55 |  |  |
Options Outstanding, Number of Options (in shares) | 130 |  |  |
Options Outstanding, Weighted Average Remaining Term | 3 years |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 48.71 |  |  |
Options Exercisable, Number of Options (in shares) | 130 |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 48.71 |  |  |
$55.99 to $59.70 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Lower Range Limit (in dollars per share) | 55.99 |  |  |
Range of Exercise Prices, Upper Range Limit (in dollars per share) | $ 59.70 |  |  |
Options Outstanding, Number of Options (in shares) | 244 |  |  |
Options Outstanding, Weighted Average Remaining Term | 3 years 9 months 18 days |  |  |
Options Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 58.12 |  |  |
Options Exercisable, Number of Options (in shares) | 163 |  |  |
Options Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 58.05 |  |  |
Stock Options [Member] |  |  |  |
Estimated weighted average fair value for options granted and significant weighted average assumptions used [Abstract] |  |  |  |
Fair Value of Options on Grant Date (in dollars per share) |  |  | $ 14.77 |
Weighted Average assumptions [Abstract] |  |  |  |
Expected Life of Options |  |  | 7 years 2 months 12 days |
Risk-Free Interest Rate |  |  | 2.10% |
Expected Volatility |  |  | 29.70% |
Expected Dividend Yield |  |  | 2.10% |
Fair Value of Common Stock on Grant Date (in dollars per share) |  |  | $ 55.99 |
Options [Roll Forward] |  |  |  |
Outstanding at Beginning of Year (in shares) | 1,429 | 1,966 | 1,921 |
Granted (in shares) | 0 | 0 | 166 |
Exercised (in shares) | (788) | (469) | (103) |
Expired or Forfeited (in shares) | (30) | (68) | (18) |
Outstanding at End of Year (in shares) | 611 | 1,429 | 1,966 | 1,921
Exercisable at End of Year (in shares) | 530 | 1,064 | 1,140 |
Vested and Expected to Vest in the Future at End of Year (in shares) | 599 | 1,249 | 1,925 |
Weighted Average Exercise Price [Abstract] |  |  |  |
Outstanding at Beginning of Year (in dollars per share) | $ 47.39 | $ 46.62 | $ 45.50 |
Granted (in dollars per share) | 0 | 0 | 55.99 |
Exercised (in dollars per share) | 45.97 | 43.74 | 40.22 |
Expired or Forfeited (in dollars per share) | 54.24 | 49.91 | 51.02 |
Outstanding at End of Year (in dollars per share) | 48.88 | 47.39 | 46.62 | $ 45.50
Exercisable at End of Year (in dollars per share) | 47.43 | 46.04 | 45.22 |
Vested and Expected to Vest in the Future at End of Year (in dollars per share) | $ 48.90 | $ 45.88 | $ 46.61 |
Weighted Average Remaining Term [Abstract] |  |  |  |
Outstanding at End of Year | 3 years 3 months 18 days |  |  |
Exercisable at End of Year | 4 years 2 months 12 days |  |  |
Vested and Expected to Vest in the Future at End of Year | 3 years 3 months 18 days |  |  |
Average Intrinsic Value [Abstract] |  |  |  |
Outstanding at End of Year | $ 10.4 |  |  |
Exercisable at End of Year | 9.8 |  |  |
Vested and Expected to Vest in the Future at End of Year | 10.2 |  |  |
Options, Additional Disclosure [Abstract] |  |  |  |
Total intrinsic value of options exercised | 10.4 | $ 20.5 | $ 1.5 |
Total grant date fair value of stock options vested | 13.4 | $ 19.3 |  |
Unrecognized share-based compensation expense | $ 0.5 |  |  |
Weighted average recognition period for unrecognized share-based compensation | 1 year |  |  |
Stock Options [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise price of stock options granted as percentage of fair market value of stock at date of grant as required by the plan | 100.00% |  |  |
Stock Options [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercisable period | 10 years |  |  |
Stock Options [Member] | Vesting on Fourth Anniversary Date Following Date of Grant [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting percentage |  |  |  | 50.00%
Stock Options [Member] | Vesting on Fifth Anniversary Date Following Date of Grant [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting percentage |  |  |  | 50.00%
Stock Options [Member] | Annual Vesting on April 30th [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting percentage |  |  | 25.00% |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 + Details
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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=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 Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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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