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Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 8,560	$ 3,848	$ 4,412
Income tax benefit	2,140	962	1,103
Educational services and facilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	481	192	240
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 8,079	$ 3,656	$ 4,172

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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