Significant accounting policies (Tables)

12 Months Ended

Mar. 31, 2019

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		Products		ISRE		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