TVS Electronics - Very high stock-in-trade

TVS Electronics has recently come up with Q4FY16 numbers. Numbers look good on YoY basis.

Revenue (Consolidated)
FY15 = 270 cr
FY16 = 594 cr Growth = 120%

Net Profit (Consolidated)
FY15 = 2.2 cr
FY16 = 4.9 cr Growth = 123%

My Question
The purchase of stock-in-trade which is a sub-item of Expenses had risen to 389cr in FY16 from 76cr in FY15 which an increase of 411%.

Can some one explain what does this mean in reference of TVS Electronics?