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Stock-Based Compensation (Tables) | 6 Months Ended
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Mar. 31, 2018
Stock-Based Compensation |
Summary of compensation cost for stock-based payment arrangements recognized in general and administrative expense |
|  | Three Months Ended |  | Six Months Ended |
|  | March 31, |  | March 31, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
|  | (in thousands) |  | (in thousands) |
Compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  | $ | 2,109 |  | $ | 1,869 |  | $ | 4,072 |  | $ | 3,521 |
Restricted stock |  |  | 6,350 |  |  | 4,709 |  |  | 11,474 |  |  | 8,958 |
|  | $ | 8,459 |  | $ | 6,578 |  | $ | 15,546 |  | $ | 12,479 |
Summary of weighted-average assumptions utilized in determining the fair value of options granted |
|  | 2018 |  | 2017 |
Risk-free interest rate |  | 2.2 | % | 2.0 | %
Expected stock volatility |  | 36.1 | % | 39.4 | %
Dividend yield |  | 4.8 | % | 3.4 | %
Expected term (in years) |  | 6.0 |  | 5.5 |
Summary of stock option activity |
|  | Three Months Ended March 31, 2018 |
|  |  |  |  |  | Weighted |  |  |  |
|  |  |  |  |  | Average |  |  |
|  |  |  | Weighted |  | Remaining |  | Aggregate |
|  |  |  | Average |  | Contractual |  | Intrinsic |
|  | Shares |  | Exercise |  | Term |  | Value |
|  | (in thousands) |  | Price |  | (in years) |  | (in millions) |
Outstanding at January 1, 2018 |  | 3,755 |  | $ | 57.82 |  |  |  |  |  |
Granted |  | 7 |  |  | 71.57 |  |  |  |  |  |
Exercised |  | (41) |  |  | 30.66 |  |  |  |  |  |
Outstanding at March 31, 2018 |  | 3,721 |  | $ | 58.15 |  | 6.24 |  | $ | 40.1 |
Vested and expected to vest at March 31, 2018 |  | 3,721 |  | $ | 58.15 |  | 6.24 |  | $ | 40.1 |
Exercisable at March 31, 2018 |  | 2,358 |  | $ | 55.64 |  | 4.75 |  | $ | 31.1 |
|  | Six Months Ended
|  | March 31, 2018
|  |  |  | Weighted
|  |  |  | Average
|  | Shares |  | Exercise
|  | (in thousands) |  | Price
Outstanding at October 1, 2017 |  | 3,278 |  | $ | 56.41
Granted |  | 667 |  |  | 58.66
Exercised |  | (224) |  |  | 34.27
Outstanding at March 31, 2018 |  | 3,721 |  | $ | 58.15
Summary of restricted stock awards and changes in restricted stock outstanding |
|  | Six Months Ended |
|  | March 31, 2018 |
|  |  |  | Weighted Average |
|  | Shares |  | Grant Date Fair |
|  | (in thousands) |  | Value per Share |
Unvested at October 1, 2017 |  | 659 |  | $ | 70.76 |
Granted |  | 619 |  |  | 59.43 |
Vested (1) |  | (251) |  |  | 71.63 |
Forfeited |  | (4) |  |  | 66.27 |
Unvested on March 31, 2018 |  | 1,023 |  | $ | 63.71 |
(1)The number of restricted stock awards vested includes shares that we withheld on behalf of our employees to satisfy the statutory tax withholding requirements.

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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