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Share-Based Compensation (Tables) | 12 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | Fair value is estimated at the grant date based on a Black-Scholes-Merton option-pricing model using the following weighted-average assumptions:
| Year Ended September 30,
| 2018 |  | 2017 |  | 2016
Expected stock price volatility | 30 | % |  | 31 | % |  | 28 | %
Expected dividend yield | — | % |  | — | % |  | — | %
Risk free interest rate | 1.23 | % |  | 0.99 | % |  | 0.83 | %
Average expected life (in years) | 3.06 |  |  | 3.08 |  |  | 3.06 |
Share-based Compensation, Stock Options, Activity [Table Text Block] | The following is a summary of stock option activity for the year ended September 30, 2018:
| Shares Available for Grant |  | Number of Options Outstanding |  | Weighted Average Exercise Price |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Term (in years) |  | Aggregate Intrinsic Value ($ millions)
Balances at September 30, 2017 | 652,494 |  |  | 881,403 |  |  | $ | 27.31 |  |  | $ | 11.55 |  |  | 3.57 |  | $ | 9.8 |
Granted | (79,800 | ) |  | 79,800 |  |  | $ | 44.17 |  |  | $ | 9.79 |  |  |  |  |
Exercised |  |  | (110,423 | ) |  | $ | 23.79 |  |  | $ | 7.98 |  |  |  |  |
Forfeited | 13,324 |  |  | (13,324 | ) |  | $ | 33.19 |  |  | $ | 7.14 |  |  |  |  |
Expired | 2,002 |  |  | (2,002 | ) |  | $ | 32.60 |  |  | $ | 6.78 |  |  |  |  |
Balances at September 30, 2018 | 588,020 |  |  | 835,454 |  |  | $ | 29.27 |  |  | $ | 11.93 |  |  | 3.01 |  | $ | 15.9 |
Exercisable at September 30, 2018 |  |  | 314,366 |  |  | $ | 27.16 |  |  | $ | 11.68 |  |  | 2.81 |  | $ | 6.7 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] | The options outstanding as of September 30, 2018 broken down by exercise price are as follows:
Exercise Price |  | Number of Options Outstanding |  | Weighted Average Exercise Price |  | Weighted Average Remaining Term (in Years)
$ | — |  | - | $ | 5.00 |  |  | — |  |  | n/a |  |  | n/a
$ | 5.00 |  | - | $ | 10.00 |  |  | — |  |  | n/a |  |  | n/a
$ | 10.00 |  | - | $ | 15.00 |  |  | — |  |  | n/a |  |  | n/a
$ | 15.00 |  | - | $ | 20.00 |  |  | — |  |  | n/a |  |  | n/a
$ | 20.00 |  | - | $ | 25.00 |  |  | 28,668 |  |  | $ | 20.54 |  |  | 0.27
$ | 25.00 |  | - | $ | 30.00 |  |  | 580,000 |  |  | $ | 25.91 |  |  | 3.37
$ | 30.00 |  | - | $ | 35.00 |  |  | 49,656 |  |  | $ | 31.37 |  |  | 1.28
$ | 35.00 |  | - | $ | 40.00 |  |  | 100,330 |  |  | $ | 38.77 |  |  | 2.27
$ | 40.00 |  | - | $ | 45.00 |  |  | 74,800 |  |  | $ | 43.88 |  |  | 3.30
$ | 45.00 |  | - | $ | 50.00 |  |  | — |  |  | n/a |  |  | n/a
$ | 50.00 |  | - | $ | 55.00 |  |  | 2,000 |  |  | $ | 55.28 |  |  | 3.89
|  |  |  | 835,454 |  |  | $ | 29.27 |  |  | 3.01
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | The following is a summary of restricted stock activity through September 30, 2018:
| Shares Available for Grant |  | Number of Shares Outstanding |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Term (in years) |  | Aggregate Intrinsic Value ($ millions)
Balances at September 30, 2017 | 1,459,976 |  |  | 354,474 |  |  | $ | 33.34 |  |  | 1.26 |  | $ | 13.6 |
Granted | (85,404 | ) |  | 85,404 |  |  | $ | 44.86 |  |  |  |  |
Vested |  |  | (162,544 | ) |  | $ | 31.14 |  |  |  |  |
Forfeited | 2,706 |  |  | (2,706 | ) |  | $ | 36.24 |  |  |  |  |
Balances at September 30, 2018 | 1,377,278 |  |  | 274,628 |  |  | $ | 38.20 |  |  | 1.15 |  | $ | 13.3 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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=96867065&loc=d3e5070-113901 + Details
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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=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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