Segment, Geographic Location and Customer Information - Additional Information (Detail)	6 Months Ended
	Sep. 30, 2015 Segment Customer	Sep. 30, 2014 Customer
Revenues From External Customers And Long Lived Assets [Line Items]
Number of reportable segments	1
Customers accounted for more than ten percent of accounts receivables | Customer	3	3
Net Accounts Receivable | Customer 1 | Customer Concentration Risk
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of accounts receivable from major customers	16.00%	22.00%
Net Accounts Receivable | Customer 2 | Customer Concentration Risk
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of accounts receivable from major customers	16.00%	20.00%
Net Accounts Receivable | Customer 3 | Customer Concentration Risk
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of accounts receivable from major customers	15.00%	16.00%