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Fair Value Disclosure - Summary of investments (Details) - Auction rate security - USD ($) $ in Thousands	Mar. 31, 2019	Jun. 30, 2018
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Cost Basis		$ 1,750
Gross Unrealized Holding Gains		0
Gross Unrealized Holding Losses		179
Fair Value		1,571
Fair Value, Measurements, Recurring
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Cost Basis	$ 1,750
Gross Unrealized Holding Gains	0
Gross Unrealized Holding Losses	(179)
Fair Value	1,571
Fair Value	$ 1,571	$ 1,571

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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