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Employee Benefit Plans Employee Benefit Plans - Employee Stock Purchase Plan, Incentive Bonus Plan and Stock-Based Compensation (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Discounted Price For Purchasing Company's Common Stock | 85.00% |  |
Employee Stock Purchase Plan, Maximum Percent of Annual Compensation | 15.00% |  |
Fair Market Value Of Common Stock Available For Purchase To Eligible Employees Maximum | $ 25,000 |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 131,348 | 141,661 | 114,340
Stock Issued During Period, Value, Employee Stock Purchase Plan | $ 5,600,000 | $ 4,600,000 | $ 4,000,000.0
Salary and Wage, Officer, Excluding Cost of Good and Service Sold | $ 34,300,000 | $ 24,400,000 | $ 23,700,000
Shares available for grant | 9,400,000 |  |
Employee Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock reserved for future issuance, shares | 2,800,000 |  |
Share-based Payment Arrangement [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock reserved for future issuance, shares | 16,400,000 |  |

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- Definition Maximum percent of employee annual compensation allowed under employee stock purchase plan. + References No definition available. + Details
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- Definition Amount of expense for salary and wage arising from service rendered by officer. Excludes allocated cost, labor-related nonsalary expense, and direct and overhead labor cost included in cost of good and service sold. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(4)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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