Annual report pursuant to Section 13 and 15(d)

Segment Information - Additional Information (Detail)

v3.19.1
Segment Information - Additional Information (Detail)
12 Months Ended
Mar. 31, 2019
Segment
Customer
Mar. 31, 2018
Customer
Mar. 31, 2017
Customer
Segment Reporting Information [Line Items]      
Number of reportable operating segments | Segment 1    
Customer Concentration Risk [Member] | Net Sales [Member]      
Segment Reporting Information [Line Items]      
Number of customers | Customer 1 0 1
Concentration risk percentage 12.00%   11.00%
Customer Concentration Risk [Member] | Net Sales [Member] | Minimum [Member]      
Segment Reporting Information [Line Items]      
Concentration risk percentage   10.00%