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Significant accounting policies (Tables)
 12 Months Ended
Mar. 31, 2018
Text block1 [abstract]  
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 10 years