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Significant accounting policies (Tables) | 12 Months Ended
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Mar. 31, 2019
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Summary of Estimated Useful Lives of Assets | The estimated useful lives of assets are as follows:
Category |  | Useful life |
Buildings |  |  | 28 to 40 years |
Plant and machinery |  |  | 5 to 21 years |
Computer equipment and software |  |  | 2 to 7 years |
Furniture, fixtures and equipment |  |  | 3 to 10 years |
Vehicles |  |  | 4 to 5 years |
Summary of Estimated Useful Lives of Aamortizable Intangible Assets | The estimated useful lives of the amortizable intangible assets for the current and comparative periods are as follows:
Category |  | Useful life |
Customer-related intangibles |  |  | 5 to 15 years |
Marketing related intangibles |  |  | 3 to 5 years |
Schedule of Disaggregation of Revenues | The table below presents disaggregated revenues from contracts with customers by business segment, customer location and contract-type. The Company believes that the below disaggregation best depicts the nature, amount, timing and uncertainty of revenue and cash flows from economic factors.
|  | IT Services |  |  | Products |  |  | ISRE |  |  | Total |
| BFSI |  |  | Health BU |  |  | CBU |  |  | ENU |  |  | TECH |  |  | MFG |  |  | COMM |  |  | Total |
A. Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rendering of services |  |  | 173,516 |  |  |  | 73,942 |  |  |  | 88,797 |  |  |  | 72,329 |  |  |  | 76,108 |  |  |  | 46,155 |  |  |  | 32,489 |  |  |  | 563,336 |  |  |  | — |  |  |  | 7,965 |  |  |  | 571,301 |
Sales of products |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 14,544 |  |  |  | — |  |  |  | 14,544 |
|  |  | 173,516 |  |  |  | 73,942 |  |  |  | 88,797 |  |  |  | 72,329 |  |  |  | 76,108 |  |  |  | 46,155 |  |  |  | 32,489 |  |  |  | 563,336 |  |  |  | 14,544 |  |  |  | 7,965 |  |  |  | 585,845 |
B. Revenue by geography |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
India |  |  | 3,868 |  |  |  | 2,295 |  |  |  | 1,006 |  |  |  | 1,690 |  |  |  | 1,392 |  |  |  | 1,534 |  |  |  | 3,095 |  |  |  | 14,880 |  |  |  | 8,154 |  |  |  | 7,965 |  |  |  | 30,999 |
Americas |  |  | 98,428 |  |  |  | 57,204 |  |  |  | 59,262 |  |  |  | 22,739 |  |  |  | 54,679 |  |  |  | 21,541 |  |  |  | 7,694 |  |  |  | 321,547 |  |  |  | 2,112 |  |  |  | — |  |  |  | 323,659 |
Europe |  |  | 46,856 |  |  |  | 7,591 |  |  |  | 17,636 |  |  |  | 29,795 |  |  |  | 16,441 |  |  |  | 18,211 |  |  |  | 7,420 |  |  |  | 143,950 |  |  |  | 2,240 |  |  |  | — |  |  |  | 146,190 |
Rest of World |  |  | 24,364 |  |  |  | 6,852 |  |  |  | 10,893 |  |  |  | 18,105 |  |  |  | 3,596 |  |  |  | 4,869 |  |  |  | 14,280 |  |  |  | 82,959 |  |  |  | 2,038 |  |  |  | — |  |  |  | 84,997 |
|  |  | 173,516 |  |  |  | 73,942 |  |  |  | 88,797 |  |  |  | 72,329 |  |  |  | 76,108 |  |  |  | 46,155 |  |  |  | 32,489 |  |  |  | 563,336 |  |  |  | 14,544 |  |  |  | 7,965 |  |  |  | 585,845 |
C. Revenue by nature of contract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed price and volume based |  |  | 89,378 |  |  |  | 53,462 |  |  |  | 50,425 |  |  |  | 51,799 |  |  |  | 47,055 |  |  |  | 31,843 |  |  |  | 19,847 |  |  |  | 343,809 |  |  |  | — |  |  |  | 6,176 |  |  |  | 349,985 |
Time and materials |  |  | 84,138 |  |  |  | 20,480 |  |  |  | 38,372 |  |  |  | 20,530 |  |  |  | 29,053 |  |  |  | 14,312 |  |  |  | 12,642 |  |  |  | 219,527 |  |  |  | — |  |  |  | 1,789 |  |  |  | 221,316 |
Products |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 14,544 |  |  |  | — |  |  |  | 14,544 |
|  |  | 173,516 |  |  |  | 73,942 |  |  |  | 88,797 |  |  |  | 72,329 |  |  |  | 76,108 |  |  |  | 46,155 |  |  |  | 32,489 |  |  |  | 563,336 |  |  |  | 14,544 |  |  |  | 7,965 |  |  |  | 585,845 |

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