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Balance sheet components - Schedule of Deferred Contract Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Financial information for each of the Company's business segments |  |
Deferred contract costs | $ 42,421 | $ 43,140
Less: Accumulated amortization | (21,530) | (24,219)
Total Deferred contract costs, net | 20,891 | 18,921
Amortization of deferred contract costs | 6,800 | $ 9,900
U.S. Services |  |
Financial information for each of the Company's business segments |  |
Impairment loss on contract costs | $ 600 |

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