Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Operating Segment Information and Concentrations of Risk - Additional Information (Detail)

v3.19.1
Operating Segment Information and Concentrations of Risk - Additional Information (Detail)
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Accounts Receivable | Customer A | Customer Concentration Risk      
Segment Reporting Information [Line Items]      
Concentration risk, percentage 8.50% 9.00%  
Sales Revenue, Net | Geographic Concentration Risk      
Segment Reporting Information [Line Items]      
Concentration risk, percentage 36.00% 22.00% 21.00%