Share-Based Compensation - Employee Stock Purchase Plan (Details) - shares shares in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Apr. 01, 2003
Stock-based Compensation
Shares authorized for issuance (in shares)	4,500
Employee Stock Purchase Plan
Stock-based Compensation
Purchase price of stock as percent of market fair value (in percent)	85.00%
Compensation authorized by the employee to be withheld for stock purchase (in percent)	10.00%
Shares authorized for issuance (in shares)				1,100
Shares issued (in shares)	66	57	47
Cumulative shares issued (in shares)	608