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Deferred Contract Costs, Net | 12 Months Ended
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Sep. 30, 2021
Revenue from Contract with Customer [Abstract] |
Deferred Contract Costs, Net | DEFERRED CONTRACT COSTS, NET
Table 19: Details of Deferred Contracts Costs, Net
| As of September 30,
| 2021 |  | 2020
| (in thousands)
Deferred contract costs | $ | 67,209 |  |  | $ | 42,421 |
Accumulated amortization | (30,723) |  |  | (21,530) |
Total deferred contract costs, net | $ | 36,486 |  |  | $ | 20,891 |
Amortization expense related to deferred contract costs for the years ended September 30, 2021, 2020, and 2019 was $13.6 million, $6.8 million, and $9.9 million, respectively. These amounts were recorded within our "cost of revenue" on our consolidated statements of operations. The amortization totals above include $4.4 million, $0.6 million, and $3.7 million of costs which were capitalized and subsequently written off during the years ended September 30, 2021, 2020, and 2019, respectively. These costs were related to contracts in our U.S. Services and Outside the U.S. segments and are deemed unrecoverable. This expense was recorded within "cost of revenue" on our consolidated statements of operations.

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