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Deferred Contract Costs, Net - Schedule of Deferred Contract Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Financial information for each of the Company's business segments |  |  |
Deferred contract costs | $ 67,209 | $ 42,421 |
Accumulated amortization | (30,723) | (21,530) |
Total deferred contract costs, net | 36,486 | 20,891 |
Amortization of deferred contract costs | 13,600 | 6,800 | $ 9,900
U.S. Services and Outside the U.S. |  |  |
Financial information for each of the Company's business segments |  |  |
Impairment loss on contract costs | $ 4,400 | $ 600 | $ 3,700

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