Stock-based compensation - Summary of RSU activity (Details) - RSU awards shares in Thousands, $ in Thousands	6 Months Ended
	Dec. 31, 2017 USD ($) shares
Number of Shares
Beginning balance (shares)	3,005
Granted (in shares)	1,684
Vested (in shares)	(812)
Canceled (shares)	(281)
Ending balance (shares)	3,596
RSUs outstanding, weighted average remaining contractual life (in years)	1 year 7 months 17 days
RSUs outstanding, aggregate intrinsic value | $	$ 19,959
RSUs expected to vest at period end (shares)	2,986
RSUs expected to vest, weighted average remaining contractual life (in years)	1 year 6 months
RSUs expected to vest, aggregate intrinsic value | $	$ 16,572