Summary of Significant Accounting Policies - Customer, Supplier and Product Concentration (Details)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Net sales | Products | Product 1
Concentration risk
Concentration risk (as a percent)	30.00%	36.00%	27.00%
Net sales | Products | Product 2
Concentration risk
Concentration risk (as a percent)	10.00%	8.00%	9.00%
Net sales | Customers | Customer A
Concentration risk
Concentration risk (as a percent)	21.00%	29.00%	28.00%
Net sales | Customers | Customer B
Concentration risk
Concentration risk (as a percent)	18.00%	17.00%	21.00%
Net sales | Customers | Customer C
Concentration risk
Concentration risk (as a percent)	12.00%
Net sales | Customers | Customer D
Concentration risk
Concentration risk (as a percent)	10.00%	5.00%	6.00%
Inventory purchases | Suppliers | JSP
Concentration risk
Concentration risk (as a percent)	29.00%	37.00%	36.00%