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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Common-stock based award plan |  |
Compensation expense (in dollars) | $ 7,921 | $ 6,982
Stock options |  |
Common-stock based award plan |  |
The period from the grant date after which options expire | 10 years |
Compensation expense (in dollars) | $ 3,550 | $ 3,062
Weighted-average assumptions utilized in determining the fair value of options |  |
Risk-free interest rate (as a percent) | 1.80% | 1.70%
Expected stock volatility (as a percent) | 37.60% | 37.00%
Dividend yield (as a percent) | 4.60% | 3.90%
Expected term | 5 years 6 months | 5 years 6 months
Options |  |
Options outstanding at the beginning of the period (in shares) | 2,776,000 |
Granted (in shares) | 876,379 |
Exercised (in shares) | (119,000) |
Forfeited/Expired (in shares) | (2,000) |
Option outstanding at the end of the period (in shares) | 3,531,000 |
Vested and expected to vest at the end of the period (in shares) | 3,495,000 |
Exercisable at the end of the period (in shares) | 2,331,000 |
Weighted-Average Exercise Price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 48.51 |
Granted (in dollars per share) | 58.25 |
Exercised (in dollars per share) | 31.19 |
Forfeited/Expired (in dollars per share) | 54.65 |
Outstanding at the end of the period (in dollars per share) | 51.51 |
Vested and expected to vest at the end of the period (in dollars per share) | 51.39 |
Exercisable at the end of the period (in dollars per share) | $ 46.06 |
Weighted- Average Remaining Contractual Term |  |
Outstanding at the end of the period | 6 years 4 months 24 days |
Vested and expected to vest at the end of the period | 6 years 4 months 24 days |
Exercisable at the end of the period | 4 years 10 months 24 days |
Aggregate Intrinsic Value |  |
Outstanding at the end of the period (in dollars) | $ 26,600 |
Vested and expected to vest at the end of the period (in dollars) | 26,700 |
Exercisable at the end of the period (in dollars) | $ 26,600 |
Weighted-average fair value of options granted (in dollars per share) | $ 13.12 |
Total intrinsic value of options exercised (in dollars) | $ 3,100 |
Unrecognized compensation cost (in dollars) | $ 12,700 |
Weighted-average period over which unrecognized compensation cost is expected to be recognized | 3 years 4 months 24 days |
Restricted stock |  |
Common-stock based award plan |  |
Compensation expense (in dollars) | $ 4,371 | $ 3,920
Options |  |
Granted (in shares) | 294,000 |
Aggregate Intrinsic Value |  |
Unrecognized compensation cost (in dollars) | $ 33,100 |
Weighted-average period over which unrecognized compensation cost is expected to be recognized | 2 years 10 months 24 days |
Restricted stock awards activity, shares |  |
Unvested at the beginning of the period (in shares) | 668,000 |
Granted (in shares) | 294,575 |
Vested (in shares) | (256,000) |
Forfeited/Expired (in shares) | (3,000) |
Unvested at the end of the period (in shares) | 703,000 |
Restricted stock awards activity, weighted average grant date fair value |  |
Unvested at the beginning of the period (in dollars per share) | $ 67.03 |
Granted (in dollars per share) | 58.25 |
Vested (in dollars per share) | 64.75 |
Forfeited/Expired (in dollars per share) | 68.57 |
Unvested at the end of the period (in dollars per share) | $ 64.17 |
Restricted stock | Minimum |  |
Common-stock based award plan |  |
Vesting period | 3 years |
Restricted stock | Maximum |  |
Common-stock based award plan |  |
Vesting period | 6 years |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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