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Nature of Business and Summary of Significant Accounting Policies - Revenues Related (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Accounts receivable, net | $ 297,427,000 | $ 266,742,000 |  |
Deferred income taxes | 6,006,000 | 13,805,000 |  |
Other assets | 79,163,000 | 36,254,000 |  |
Other accrued liabilities | 32,454,000 | 31,025,000 |  |
Deferred revenue | 111,016,000 | 103,335,000 |  |
Stockholders' Equity Attributable to Parent | 289,767,000 | 287,437,000 | $ 466,183,000 | $ 481,316,000
Capitalized Contract Cost, Net | $ 33,700,000 | 27,100,000 |  |
Capitalized Contract Cost, Amortization Period | 10 years |  |  |
Capitalized Contract Cost, Amortization | $ 5,000,000.0 | 4,500,000 | $ 4,200,000 |
Capitalized Contract Cost, Impairment Loss | $ 0 |  |  |
As Previously Reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Accounts receivable, net |  | 208,865,000 |  |
Deferred income taxes |  | 20,117,000 |  |
Other assets |  | 12,431,000 |  |
Other accrued liabilities |  | 30,457,000 |  |
Deferred revenue |  | 52,215,000 |  |
Stockholders' Equity Attributable to Parent |  | 263,737,000 |  |
Accounting Standards Update 2014-09 | Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Accounts receivable, net |  | 57,877,000 |  |
Deferred income taxes |  | (6,312,000) |  |
Other assets |  | 23,823,000 |  |
Other accrued liabilities |  | 568,000 |  |
Deferred revenue |  | 51,120,000 |  |
Stockholders' Equity Attributable to Parent |  | $ 23,700,000 |  |

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