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Balance sheet components (Tables) | 12 Months Ended
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Sep. 30, 2020
Balance Sheet Related Disclosures [Abstract] |
Schedule of Cash and Cash Equivalents | Our balances for cash, cash equivalents and restricted cash are as follows:
|  | As of September 30,
(in thousands) |  | 2020 |  | 2019 |  | 2018 |  | 2017
Cash and cash equivalents |  | $ | 71,737 |  |  | $ | 105,565 |  |  | $ | 349,245 |  |  | $ | 166,252 |
Restricted cash (recorded within "prepaid expenses and other current assets") |  | 16,824 |  |  | 10,927 |  |  | 7,314 |  |  | 13,475 |
Cash, cash equivalents and restricted cash |  | $ | 88,561 |  |  | $ | 116,492 |  |  | $ | 356,559 |  |  | $ | 179,727 |
Restrictions on Cash and Cash Equivalents | Our balances for cash, cash equivalents and restricted cash are as follows:
|  | As of September 30,
(in thousands) |  | 2020 |  | 2019 |  | 2018 |  | 2017
Cash and cash equivalents |  | $ | 71,737 |  |  | $ | 105,565 |  |  | $ | 349,245 |  |  | $ | 166,252 |
Restricted cash (recorded within "prepaid expenses and other current assets") |  | 16,824 |  |  | 10,927 |  |  | 7,314 |  |  | 13,475 |
Cash, cash equivalents and restricted cash |  | $ | 88,561 |  |  | $ | 116,492 |  |  | $ | 356,559 |  |  | $ | 179,727 |
Schedule of property, plant and equipment | Property and equipment, at cost, consists of the following:
|  | As of September 30,
(in thousands) |  | 2020 |  | 2019
Land |  | $ | 1,738 |  |  | $ | 1,738 |
Building and improvements |  | 11,846 |  |  | 12,044 |
Office furniture and equipment |  | 239,057 |  |  | 246,671 |
Leasehold improvements |  | 84,063 |  |  | 69,183 |
|  | 336,704 |  |  | 329,636 |
Less: Accumulated depreciation and amortization |  | (269,983) |  |  | (230,047) |
Total property and equipment, net |  | $ | 66,721 |  |  | $ | 99,589 |
Components of capitalized software | Capitalized software consists of the following:
|  | As of September 30,
(in thousands) |  | 2020 |  | 2019
Capitalized software |  | $ | 120,677 |  |  | $ | 103,643 |
Less: Accumulated amortization |  | (82,644) |  |  | (71,274) |
Total capitalized software, net |  | $ | 38,033 |  |  | $ | 32,369 |
Deferred contract costs | Deferred contract costs consist of the following:
|  | As of September 30,
(in thousands) |  | 2020 |  | 2019
Deferred contract costs |  | $ | 42,421 |  |  | $ | 43,140 |
Less: Accumulated amortization |  | (21,530) |  |  | (24,219) |
Total deferred contract costs, net |  | $ | 20,891 |  |  | $ | 18,921 |

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