Share-Based Compensation Stock option activity (Details) - Employee Stock Option - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Options, outstanding [Roll Forward]
Options outstanding, start of year (in shares)	2,893
Granted (in shares)	1,370
Exercise of stock options (in shares)	(586)
Expired or forfeited (in shares)	(128)
Options outstanding, end of year (in shares)	3,549	2,893
Vested as of June 30, 2018 (in shares)	1,852
Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, options outstanding, start of year (in USD per share)	$ 3.48
Granted (in USD per share)	14.90
Exercised (in USD per share)	3.86
Expired or forfeited (in USD per share)	10.19
Weighted average exercise price, options outstanding, end of year (in USD per share)	7.58	$ 3.48
Vested as of June 30, 2018 (in USD per share)	$ 3.47
Weighted average remaining contractual term (years) [Roll Forward]
Weighted average remaining contractual term	4 years 5 months 4 days	3 years 11 months 16 days
Weighted average remaining contractual term, vested as of June 30, 2018	2 years 10 months 24 days
Intrinsic value [Roll Forward]
Options, outstanding, intrinsic value, start of year	$ 15,490
Options, outstanding, intrinsic value, end of year	57,123	$ 15,490
Options, vested, outstanding, intrinsic value as of 30 June 2018	$ 37,420