Income Taxes - Effective Income tax Rate (Details)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
The effective income tax rate differs from the U.S. Federal statutory income tax rate
Federal statutory income tax rate	28.00%	34.00%	35.00%
State income taxes, net of federal benefit	2.50%	5.90%	2.80%
Foreign tax rate difference	1.60%	(4.60%)	(2.30%)
Tax return to provision true-up	(7.40%)	0.60%	0.70%
Other differences	0.20%	(2.10%)	0.00%
Revalue of deferred for change in federal tax rate	14.90%	0.00%	0.00%
Permanent differences:
— stock based compensation	0.70%	4.60%	0.90%
— domestic production activities deduction	(1.50%)	(3.30%)	(4.40%)
— tax credits	(1.30%)	(0.90%)	(0.70%)
— meals and entertainment	0.90%	3.40%	1.00%
— penalties	0.10%	1.50%	0.00%
— other	0.90%	4.30%	(3.90%)
Change in valuation allowance	0.10%	1.30%	0.60%
Net income tax provision	39.70%	44.70%	29.70%