Fair Value Disclosure - Assets Measured on Recurring Basis Roll Forward (Details) - Level 3 - Fair Value, Measurements, Recurring - Auction rate securities - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance as of beginning of period	$ 2,643	$ 2,633	$ 2,643	$ 2,633
Total realized gains or (losses) included in net income	0	0	0	0
Total unrealized gains or (losses) included in other comprehensive income	0	0	0	0
Sales and settlements at par	0	0	0	0
Transfers in and/or out of Level 3	0	0	0	0
Balance as of end of period	$ 2,643	$ 2,633	$ 2,643	$ 2,633