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Intangible Assets
 9 Months Ended
Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
The following table provides the gross carrying value, accumulated amortization, net book value and remaining useful life for those intangible assets that are subject to amortization as of June 30, 2023:
Gross Carrying ValueAccumulated AmortizationNet Book ValueWeighted Average Remaining Useful Life (Years)
Accreditations and regulatory approvals$16,300 $— $16,300 Indefinite
Trademarks, trade names and other1,942 (597)1,345 5.34
Curriculum1,800 (297)1,503 4.22
Total$20,042 $(894)$19,148 4.75

The following table provides the gross carrying value, accumulated amortization, net book value and remaining useful life for those intangible assets that were subject to amortization as of June 30, 2022:
Gross Carrying ValueAccumulated AmortizationNet Book ValueWeighted Average Remaining Useful Life (Years)
Accreditations and regulatory approvals - MIAT$12,800 $— $12,800 Indefinite
Trademarks and trade names - MIAT3,000 — 3,000 Indefinite
Curriculum - MIAT400 (53)347 4.33
Non-compete agreement and trade name442 (345)97 2.83
Total$16,642 $(398)$16,244 3.99

Amortization expense for the nine months ended June 30, 2023 and 2022 was $0.5 million and $80 thousand, respectively.

As of June 30, 2023, of the $20.0 million gross carrying value of intangible assets, $5.4 million relates to the Concorde Acquisition, $14.2 million relates to the MIAT acquisition completed on November 1, 2021, and $0.4 million relates to previously recorded non-compete agreements and trade names. The remaining weighted average useful lives shown are calculated based on the net book value and remaining amortization period of each respective intangible asset. Amortization is computed using the straight-line method based on estimated useful lives of the related assets. Our indefinite-lived intangible assets are reviewed at least annually for impairment as of August 1, or more frequently if there are indicators of impairment. There were no indicators of impairment for our indefinite-lived intangible assets as of June 30, 2023.