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Property and Equipment | 12 Months Ended
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Sep. 30, 2018
Property and Equipment |
Property and Equipment | 5. Property and Equipment Property and equipment, at cost, consists of the following:
|  | Fiscal Year Ended |  |  |  |
|  | September 30, |  | September 30, |  | Useful Lives
|  | 2018 |  | 2017 |  | (years)
|  | (in millions) |  |  |  |
Building and land |  | $ | 75.2 |  | $ | 63.6 |  | 10 | - | 45
Leasehold improvements |  |  | 399.2 |  |  | 404.6 |  | 1 | - | 20
Computer systems and equipment |  |  | 741.2 |  |  | 694.6 |  | 3 | - | 12
Furniture and fixtures |  |  | 132.5 |  |  | 135.9 |  | 3 | - | 10
Total |  |  | 1,348.1 |  |  | 1,298.7 |  |  |  |
Accumulated depreciation and amortization |  |  | (734.0) |  |  | (677.3) |  |  |  |
Property and equipment, net |  | $ | 614.1 |  | $ | 621.4 |  |  |  |
Depreciation expense for the fiscal years ended September 30, 2018, 2017 and 2016 were $158.5 million, $157.1 million, and $171.7 million, respectively. Depreciation is calculated using primarily the straight‑line method over the estimated useful lives of the assets, or in the case of leasehold improvements and capitalized leases, the lesser of the remaining term of the lease or its estimated useful life.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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