Share-Based Compensation - Employee Stock Purchase Plan (Details) - shares shares in Thousands	6 Months Ended
	Dec. 31, 2017	Dec. 31, 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)	28	27
Cumulative shares issued (in shares)	571