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Balance sheet components | 12 Months Ended
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Sep. 30, 2019
Balance Sheet Related Disclosures [Abstract] |
Balance sheet components | Balance sheet components Property and equipment Property and equipment, at cost, consists of the following (in thousands):
| As of September 30, |  |
| 2019 |  | 2018
Land | $ | 1,738 |  |  | $ | 1,738 |
Building and improvements | 12,044 |  |  | 12,044 |
Office furniture and equipment | 246,671 |  |  | 203,512 |
Leasehold improvements | 69,183 |  |  | 55,918 |
| 329,636 |  |  | 273,212 |
Less: Accumulated depreciation and amortization | (230,047) |  |  | (195,668) |
Total property and equipment, net | $ | 99,589 |  |  | $ | 77,544 |
Depreciation expense for the years ended September 30, 2019, 2018 and 2017 was $45.2 million, $40.7 million and $45.2 million, respectively. Capitalized software Capitalized software consists of the following (in thousands):
| As of September 30, |  |
| 2019 |  | 2018
Capitalized software | $ | 103,643 |  |  | $ | 94,803 |
Less: Accumulated amortization | (71,274) |  |  | (72,374) |
Total capitalized software, net | $ | 32,369 |  |  | $ | 22,429 |
Amortization expense for the years ended September 30, 2019, 2018 and 2017 was $7.2 million, $11.2 million and $10.6 million, respectively. Most of this amortization was recorded within our "cost of revenue" on our consolidated statements of operations. Deferred contract costs For many contracts, we incur significant incremental costs at the beginning of an arrangement. Typically, these costs relate to the establishment of infrastructure which we utilize to satisfy our performance obligations with the contract. We report these costs as deferred contract costs and amortize them on a straight-line basis over the shorter of the useful economic life of the asset or the anticipated term of the contract. Deferred contract costs consist of the following (in thousands):
| As of September 30, |  |
| 2019 |  | 2018
Deferred contract costs | $ | 43,140 |  |  | $ | 29,941 |
Less: Accumulated amortization | (24,219) |  |  | (15,561) |
Total deferred contract costs, net | $ | 18,921 |  |  | $ | 14,380 |
Since September 30, 2018, we have deferred $14.5 million of costs. During the year ended September 30, 2019, we amortized $9.9 million of deferred contract costs. This amortization was recorded within our "cost of revenue" on our consolidated statements of operations. The totals above include $3.7 million of costs which were deferred and subsequently written off during the year ended September 30, 2019. These costs related to a contract within our U.S. Health and Human Services Segment which is no longer able to recover the deferred costs. This expense was recorded within "cost of revenue" on our consolidated statements of operations.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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