Property and Equipment, net (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Property, Plant and Equipment [Line Items]
Right-of-use assets for finance leases	$ 5,603	$ 5,603
Property and equipment and right-of-use assets for finance leases, gross	473,001	452,710
Less: accumulated depreciation and amortization	(208,204)	(186,364)
Property and equipment, net	264,797	266,346
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	25,601	25,601
Building and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 165,667	160,920
Building and building improvements \| Minimum
Property, Plant and Equipment [Line Items]
Depreciable Lives (in years)	3 years
Building and building improvements \| Maximum
Property, Plant and Equipment [Line Items]
Depreciable Lives (in years)	30 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 94,473	87,525
Leasehold improvements \| Minimum
Property, Plant and Equipment [Line Items]
Depreciable Lives (in years)	1 year
Leasehold improvements \| Maximum
Property, Plant and Equipment [Line Items]
Depreciable Lives (in years)	20 years
Training equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 119,171	110,292
Training equipment \| Minimum
Property, Plant and Equipment [Line Items]
Depreciable Lives (in years)	3 years
Training equipment \| Maximum
Property, Plant and Equipment [Line Items]
Depreciable Lives (in years)	10 years
Office and computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 36,454	37,251
Office and computer equipment \| Minimum
Property, Plant and Equipment [Line Items]
Depreciable Lives (in years)	3 years
Office and computer equipment \| Maximum
Property, Plant and Equipment [Line Items]
Depreciable Lives (in years)	10 years
Curriculum development
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 5,127	2,478
Curriculum development \| Minimum
Property, Plant and Equipment [Line Items]
Depreciable Lives (in years)	3 years
Curriculum development \| Maximum
Property, Plant and Equipment [Line Items]
Depreciable Lives (in years)	5 years
Software developed for internal use
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 13,045	12,573
Software developed for internal use \| Minimum
Property, Plant and Equipment [Line Items]
Depreciable Lives (in years)	1 year
Software developed for internal use \| Maximum
Property, Plant and Equipment [Line Items]
Depreciable Lives (in years)	5 years
Vehicles
Property, Plant and Equipment [Line Items]
Depreciable Lives (in years)	5 years
Property and equipment, gross	$ 1,546	1,406
Right-of-use assets for finance leases
Property, Plant and Equipment [Line Items]
Depreciable Lives (in years)	15 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 6,314	$ 9,061

Amount, before accumulated amortization, of right-of-use asset from finance lease.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
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-Topic 842
-Publisher FASB
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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