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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue consisted of tuition	99.00%	99.00%	98.00%
Repayment term	10 years
Expenses Incurred with bank and other services	$ 900	$ 1,100	$ 1,300
Goodwill	$ 8,222	8,222
Decrease in average students enrolled	3.80%
Increase in new student enrollments	3.40%
Accrued Insurance	$ 3,400
Advertising Expenses	39,700	41,200	44,800
Stock Based Compensation Expenses	2,077	1,440	1,864
Tax Benefit	519	360	466
Cash and cash equivalents	76,803	65,442	58,104	$ 50,138
Restricted Cash	12,116	15,113	$ 14,055	$ 14,822
Held-to-maturity investments	$ 38,055	$ 0
Percentage of cash basis revenue collected from funds distributed under Title IV programs	66.00%
Percentage of Cash Basis Revenue Collected from Funds Distributed Under Veterans Benefits Programs	17.00%
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Market interest rates	7.00%
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Market interest rates	10.00%

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Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverage's to employees.

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