Operating Risk (Tables)

12 Months Ended

Mar. 31, 2017

Sales Revenue, Net [Member]

Concentration Risk [Line Items]

Schedule of Operating Risks

Details of customers accounting for 10% or more of total net sales for each of the three years ended March 31, 2015, 2016 and 2017 are as follows:

	Percentage of net sales Year ended March 31,
	2015			2016			2017
Customer A		16.5	%		12.7	%		12.8	%
Customer B		*			13.6	%		10.6	%
Customer C		13.7	%		10.4	%		10.2	%

* Less than 10%

Accounts Receivable [Member]

Concentration Risk [Line Items]

Schedule of Operating Risks

Debtors accounting for 10% or more of total accounts receivable at March 31, 2016 and 2017, respectively, are as follows:

	Percentage of accounts receivable at March 31,
	2016			2017
Customer A		23.7	%		22.2	%
Customer D		*			14.8	%

* Less than 10%