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Summary of significant accounting policies (Tables) | 12 Months Ended
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Mar. 31, 2019
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Estimated Useful Lives of Property and Equipment | Depreciation and amortization is computed using the straight-line method over the estimated useful lives of the assets, which are as follows:
Asset description |  | Asset life (in years) |
Buildings |  |  | 20 |
Computers and software |  |  | 3-4 |
Furniture, fixtures and office equipment |  |  | 2-5 |
Vehicles |  |  | 3 |
Leasehold improvements |  |  | Lesser of estimated useful life or lease term |
Estimated Useful Life of Intangible Assets | The Company’s definite lived intangible assets are amortized over the estimated useful life of the assets on a straight-line basis, as given below.
Asset description |  | Weighted average amortization period (in months) |
Customer contracts |  |  | 47 |
Customer relationships |  |  | 217 |
Covenant not-to-compete |  |  | 48 |
Trade names |  |  | 34 |
Technology |  |  | 94 |
Intellectual Property and other rights |  |  | 24 |
Software |  |  | 53 |
Service mark |  |  | Indefinite useful life |

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