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Stock-Based Compensation (Tables) | 12 Months Ended
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Apr. 30, 2018
Stock-Based Compensation [Abstract] |
Estimated Weighted-Average Fair Value for Options Granted and Significant Weighted-Average Assumptions Used | The following table provides the estimated weighted average fair value for options granted in fiscal year 2016 using the Black-Scholes option-pricing model and the significant weighted average assumptions used in their determination. The expected life represents an estimate of the period of time stock options will be outstanding based on the historical exercise behavior of option recipients. The risk-free interest rate is based on the corresponding U.S. Treasury yield curve in effect at the time of the grant. The expected volatility is based on the historical volatility of our Common Stock price over the estimated life of the option, while the dividend yield is based on the expected dividend payments to be made by us.
|  | 2016 |
Fair Value of Options on Grant Date |  | $ | 14.77 |
Weighted Average assumptions: |  |  |  |
Expected Life of Options (years) |  |  | 7.2 |
Risk-Free Interest Rate |  |  | 2.1 | %
Expected Volatility |  |  | 29.7 | %
Expected Dividend Yield |  |  | 2.1 | %
Fair Value of Common Stock on Grant Date |  | $ | 55.99 |
Stock Option Plans | A summary of the activity and status of our stock option plans follows:
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | Number of Options (in 000's) |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Term (in years) |  |  | Aggregate Intrinsic Value (in millions) |  |  | Number of Options (in 000's) |  |  | Weighted Average Exercise Price |  |  | Number of Options (in 000's) |  |  | Weighted Average Exercise Price |
Outstanding at Beginning of Year |  |  | 1,429 |  |  | $ | 47.39 |  |  |  |  |  |  |  |  |  | 1,966 |  |  | $ | 46.62 |  |  |  | 1,921 |  |  | $ | 45.50 |
Granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |  | — |  |  | $ | — |  |  |  | 166 |  |  | $ | 55.99 |
Exercised |  |  | (788 | ) |  | $ | 45.97 |  |  |  |  |  |  |  |  |  | (469 | ) |  | $ | 43.74 |  |  |  | (103 | ) |  | $ | 40.22 |
Expired or Forfeited |  |  | (30 | ) |  | $ | 54.24 |  |  |  |  |  |  |  |  |  | (68 | ) |  | $ | 49.91 |  |  |  | (18 | ) |  | $ | 51.02 |
Outstanding at End of Year |  |  | 611 |  |  | $ | 48.88 |  |  |  | 3.3 |  |  | $ | 10.4 |  |  |  | 1,429 |  |  | $ | 47.39 |  |  |  | 1,966 |  |  | $ | 46.62 |
Exercisable at End of Year |  |  | 530 |  |  | $ | 47.43 |  |  |  | 4.2 |  |  | $ | 9.8 |  |  |  | 1,064 |  |  | $ | 46.04 |  |  |  | 1,140 |  |  | $ | 45.22 |
Vested and Expected to Vest in the Future at April 30 |  |  | 599 |  |  | $ | 48.90 |  |  |  | 3.3 |  |  | $ | 10.2 |  |  |  | 1,249 |  |  | $ | 45.88 |  |  |  | 1,925 |  |  | $ | 46.61 |
Stock Options Outstanding and Exercisable | The following table summarizes information about stock options outstanding and exercisable at April 30, 2018:
|  |  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  |  | Number of Options (in 000's) |  |  | Weighted Average Remaining Term (in years) |  |  | Weighted Average Exercise Price |  |  | Number of Options (in 000's) |  |  | Weighted Average Exercise Price |
$ | 35.04 |  |  |  | 11 |  |  |  | 1.2 |  |  | $ | 35.04 |  |  |  | 11 |  |  | $ | 35.04 |
$ | 39.53 to $40.02 |  |  |  | 226 |  |  |  | 3.1 |  |  | $ | 39.62 |  |  |  | 226 |  |  | $ | 39.62 |
$ | 47.55 to $49.55 |  |  |  | 130 |  |  |  | 3.0 |  |  | $ | 48.71 |  |  |  | 130 |  |  | $ | 48.71 |
$ | 55.99 to $59.70 |  |  |  | 244 |  |  |  | 3.8 |  |  | $ | 58.12 |  |  |  | 163 |  |  | $ | 58.05 |
Total/Average |  |  |  | 611 |  |  |  | 3.3 |  |  | $ | 48.88 |  |  |  | 530 |  |  | $ | 47.43 |
Activity for Performance-Based and Other Restricted Stock Awards | Activity for performance-based and other restricted stock awards during fiscal years 2018, 2017, and 2016 was as follows (shares in thousands):
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | Restricted Shares |  |  | Weighted Average Grant Date Value |  |  | Restricted Shares |  |  | Restricted Shares |
Nonvested Shares at Beginning of Year |  |  | 913 |  |  | $ | 51.85 |  |  |  | 915 |  |  |  | 752 |
Granted |  |  | 525 |  |  | $ | 53.59 |  |  |  | 509 |  |  |  | 289 |
Change in Shares Due to Performance |  |  | (107 | ) |  | $ | 55.70 |  |  |  | (67 | ) |  |  | 86 |
Vested and Issued |  |  | (318 | ) |  | $ | 49.47 |  |  |  | (267 | ) |  |  | (154 | )
Forfeited |  |  | (152 | ) |  | $ | 52.40 |  |  |  | (177 | ) |  |  | (58 | )
Nonvested Shares at End of Year |  |  | 861 |  |  | $ | 53.22 |  |  |  | 913 |  |  |  | 915 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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) -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 (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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