Summary of Significant Accounting Policies - Concentration Risk (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2016 customer supplier	Sep. 30, 2015 customer supplier	Sep. 30, 2016 customer supplier financial_instituion	Sep. 30, 2015 customer supplier	Mar. 31, 2016 customer
Concentration Risk [Line Items]
Number of financial institutions (financial institution) | financial_instituion			2
Cost of Sales | Supplier Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%	10.00%	10.00%	10.00%
Concentration risk, number of entities involved in risk calculation | supplier	0	0	0	0
Sales Revenue, Services, Net | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%	10.00%	10.00%	10.00%
Concentration risk, number of entities involved in risk calculation	0	0	0	0
Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage			10.00%		10.00%
Concentration risk, number of entities involved in risk calculation			1		1