| Balance Sheet Components Certain balance sheet components are as follows: | | | | | | | | | | | | | | January 31, 2021 | | January 26, 2020 | | | | | | (In millions) | | Inventories: | | | | | Raw materials | $ | 632 | | | $ | 249 | | | Work in-process | 457 | | | 265 | | | Finished goods | 737 | | | 465 | | | Total inventories | $ | 1,826 | | | $ | 979 | |
| | | | | | | | | | | | | | | | | | | | January 31, 2021 | | January 26, 2020 | | Estimated Useful Life | | | | | | | | (In millions) | | (In years) | | Property and Equipment: | | | | | | | Land | $ | 218 | | | $ | 218 | | | (A) | | Building | 341 | | | 340 | | | 25-30 | | Test equipment | 782 | | | 532 | | | 3-5 | | | | | | | | Computer equipment and software | 1,187 | | | 908 | | | 3-5 | | Leasehold improvements | 385 | | | 293 | | | (B) | | | | | | | | Office furniture and equipment | 86 | | | 74 | | | 5 | | Construction in process | 558 | | | 320 | | | (C) | | Total property and equipment, gross | 3,557 | | | 2,685 | | | | | Accumulated depreciation and amortization | (1,408) | | | (1,011) | | | | | Total property and equipment, net | $ | 2,149 | | | $ | 1,674 | | | |
(A)Land is a non-depreciable asset. (B)Leasehold improvements and finance leases are amortized based on the lesser of either the asset’s estimated useful life or the expected lease term. (C)Construction in process represents assets that are not available for their intended use as of the balance sheet date. Depreciation expense for fiscal years 2021, 2020, and 2019 was $486 million, $355 million, and $233 million, respectively. Accumulated amortization of leasehold improvements and finance leases was $223 million and $216 million as of January 31, 2021 and January 26, 2020, respectively.
| | | | | | | | | | | | | | January 31, 2021 | | January 26, 2020 | | | | | | Other assets: | (In millions) | | Advanced consideration for acquisition | $ | 1,357 | | | $ | — | | | Prepaid royalties | 440 | | | 1 | | | Investment in non-affiliated entities | 144 | | | 77 | | | Deposits | 136 | | | 8 | | | Other | 67 | | | 32 | | | Total other assets | $ | 2,144 | | | $ | 118 | |
| | | | | | | | | | | | | | January 31, 2021 | | January 26, 2020 | | | | | | (In millions) | | Accrued and Other Current Liabilities: | | | | | Customer program accruals | $ | 630 | | | $ | 462 | | | Accrued payroll and related expenses | 297 | | | 185 | | | Deferred revenue (1) | 288 | | | 141 | | | Licenses and royalties | 128 | | | 66 | | | Operating leases | 121 | | | 91 | | | Coupon interest on debt obligations | 74 | | | 20 | | | Taxes payable | 61 | | | 61 | | | Product warranty and return provisions | 39 | | | 24 | | | | | | | | | | | | | | | Professional service fees | 26 | | | 18 | | | | | | | | | | | | | | | Other | 61 | | | 29 | | | Total accrued and other current liabilities | $ | 1,725 | | | $ | 1,097 | |
(1)Deferred revenue primarily includes customer advances and deferrals related to license and development arrangements and PCS. | | | | | | | | | | | | | | January 31, 2021 | | January 26, 2020 | | | | | | (In millions) | | Other Long-Term Liabilities: | | | | | Income tax payable (1) | $ | 836 | | | $ | 528 | | | Deferred income tax | 241 | | | 29 | | | Deferred revenue (2) | 163 | | | 60 | | | Licenses payable | 56 | | | 110 | | | Employee benefits | 33 | | | 22 | | | | | | | Other | 46 | | | 26 | | | Total other long-term liabilities | $ | 1,375 | | | $ | 775 | |
(1)As of January 31, 2021, income tax payable represents the long-term portion of the one-time transition tax payable of $284 million, long-term portion of the unrecognized tax benefits of $352 million, related interest and penalties of $43 million, and other foreign long-term tax payable of $157 million. (2)Deferred revenue primarily includes deferrals related to PCS. Deferred Revenue The following table shows the changes in deferred revenue during fiscal years 2021 and 2020. | | | | | | | | | | | | | | January 31, 2021 | | January 26, 2020 | | | | | | (In millions) | | Balance at beginning of period | $ | 201 | | | $ | 138 | | | Deferred revenue added during the period | 536 | | | 334 | | | Addition due to business combinations | 75 | | | — | | | Revenue recognized during the period | (361) | | | (271) | | | Balance at end of period | $ | 451 | | | $ | 201 | |
Revenue related to remaining performance obligations represents the remaining contracted license, development arrangements and PCS that has not been recognized. This includes related deferred revenue currently recorded and amounts that will be invoiced in future periods. As of January 31, 2021, the amount of our remaining performance that has not been recognized as revenue was $683 million, of which we expect to recognize approximately 44% as revenue over the next twelve months and the remainder thereafter. This amount excludes the value of remaining performance obligations for contracts with an original expected length of one year or less.
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