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Stock Option Plans (Tables) | 12 Months Ended
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Mar. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Weighted-Average Assumptions Used to Value Option Awards | The weighted-average assumptions used in the Black-Scholes model to value the option awards in fiscal 2016 and 2015 are as follows:
|  | 2016 |  |  | 2015 |
Dividend Yield |  |  | 2.0 | % |  |  | 2.0 | %
Expected Volatility |  |  | 36.5 | % |  |  | 44.8 | %
Risk Free Interest Rate |  |  | 1.85 | % |  |  | 1.86 | %
Expected Life |  |  | 6.0 years |  |  |  | 6.0 years |
Stock Option Activity | The following table represents stock option activity for the years presented:
|  | For the Years Ended March 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Number of Shares |  |  | Weighted Average Exercise Price |
Outstanding Options at Beginning of Year |  |  | 1,665,565 |  |  | $ | 46.37 |  |  |  | 2,788,999 |  |  | $ | 41.83 |  |  |  | 3,022,592 |  |  | $ | 37.83 |
Granted |  |  | 318,572 |  |  | $ | 79.83 |  |  |  | 297,151 |  |  | $ | 86.41 |  |  |  | 256,989 |  |  | $ | 68.00 |
Exercised |  |  | (137,874 | ) |  | $ | 27.58 |  |  |  | (151,085 | ) |  | $ | 32.38 |  |  |  | (485,582 | ) |  | $ | 29.72 |
Cancelled |  |  | (28,500 | ) |  | $ | 86.35 |  |  |  | (1,269,500 | ) |  | $ | 47.43 |  |  |  | (5,000 | ) |  | $ | 53.22 |
Outstanding Options at End of Year |  |  | 1,817,763 |  |  | $ | 53.03 |  |  |  | 1,665,565 |  |  | $ | 46.37 |  |  |  | 2,788,999 |  |  | $ | 41.83 |
Options Exercisable at End of Year |  |  | 1,285,412 |  |  |  |  |  |  |  | 1,035,166 |  |  |  |  |  |  |  | 818,215 |  |  |  |  |
Weighted Average Fair Value of Options Granted during the Year |  |  |  |  |  | $ | 24.27 |  |  |  |  |  |  | $ | 32.31 |  |  |  |  |  |  | $ | 26.35 |
Stock Options Outstanding | The following table summarizes information about stock options outstanding at March 31, 2016:
|  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  | Number of Shares Outstanding |  |  | Weighted Average Remaining Contractual Life |  |  | Weighted Average Exercise Price |  |  | Number of Shares Outstanding |  |  | Weighted Average Exercise Price |
$23.17 - $30.74 |  |  | 476,671 |  |  |  | 4.04 |  |  | $ | 26.59 |  |  |  | 474,671 |  |  | $ | 26.58 |
$33.08 - $37.95 |  |  | 465,933 |  |  |  | 5.98 |  |  | $ | 33.91 |  |  |  | 445,933 |  |  | $ | 33.87 |
$53.22 - $74.10 |  |  | 307,936 |  |  |  | 7.06 |  |  | $ | 66.10 |  |  |  | 194,825 |  |  | $ | 66.64 |
$79.73 - $93.56 |  |  | 567,223 |  |  |  | 8.75 |  |  | $ | 83.87 |  |  |  | 169,983 |  |  | $ | 86.67 |
|  |  | 1,817,763 |  |  |  | 6.52 |  |  | $ | 53.03 |  |  |  | 1,285,412 |  |  | $ | 43.12 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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