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v3.19.3.a.u2

Equity Transactions - Fair Value (Details) | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Stock options |  |  |
Fair value assumptions |  |  |
Dividend yield | 0.00% | 0.00% | 0.00%
Expected volatility, minimum (as a percent) | 47.80% | 50.80% | 54.20%
Expected volatility, maximum (as a percent) | 53.70% | 58.60% | 54.90%
Risk free interest rate, minimum (as a percent) | 1.90% | 0.50% | 1.70%
Risk free interest rate, maximum (as a percent) | 2.80% | 2.70% | 2.20%
Expected term |  | 3 years 9 months 18 days | 3 years 9 months 18 days
Stock options | Minimum |  |  |
Fair value assumptions |  |  |
Expected term | 4 years 2 months 12 days |  |
Stock options | Maximum |  |  |
Fair value assumptions |  |  |
Expected term | 7 years 1 month 6 days |  |
Stock appreciation rights |  |  |
Fair value assumptions |  |  |
Dividend yield | 0.00% | 0.00% | 0.00%
Expected volatility, minimum (as a percent) | 38.20% | 34.90% | 38.20%
Expected volatility, maximum (as a percent) | 48.80% | 53.60% | 48.80%
Risk free interest rate, minimum (as a percent) | 1.30% | 2.60% | 1.30%
Risk free interest rate, maximum (as a percent) | 1.70% | 2.80% | 1.60%
Stock appreciation rights | Minimum |  |  |
Fair value assumptions |  |  |
Expected term | 1 month 6 days | 1 month 6 days | 1 year
Stock appreciation rights | Maximum |  |  |
Fair value assumptions |  |  |
Expected term | 3 years 3 months 18 days | 2 years | 3 years
Stock options, RSUs and SARS, market based |  |  |
Fair value assumptions |  |  |
Dividend yield | 0.00% | 0.00% | 0.00%
Expected volatility, minimum (as a percent) | 45.50% | 50.00% |
Expected volatility, maximum (as a percent) | 55.00% | 54.50% |
Risk free interest rate, minimum (as a percent) | 1.50% | 2.00% |
Risk free interest rate, maximum (as a percent) | 2.90% | 2.50% |
Expected volatility |  |  | 0.00%
Risk-free interest rate |  |  | 0.00%
Expected holding period (as a percent) |  | 20.30% | 0.00%
Stock options, RSUs and SARS, market based | Minimum |  |  |
Fair value assumptions |  |  |
Expected holding period (as a percent) | 25.90% |  |
Stock options, RSUs and SARS, market based | Maximum |  |  |
Fair value assumptions |  |  |
Expected holding period (as a percent) | 100.00% |  |

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- Definition Share-Based Compensation Arrangement By Share-Based Payment Award, Fair Value Assumptions, Expected Holding Period + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum 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 No definition available. + Details
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- Definition The estimated measure of the minimum 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 No definition available. + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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