Treasury Stock (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Equity [Abstract]
Treasury Stock, Shares	26,507,903	26,107,903
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	3,483,000	3,883,000
Treasury Stock, Value	$ 1,110,124	$ 1,055,260
Treasury Stock, Shares, Acquired	400,000
Purchase of treasury stock	$ 54,864	$ 48,986	$ 130,140