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Fair Value Disclosure - Reconciliation of financial assets measured at fair value on a recurring basis (Details) - Fair Value, Measurements, Recurring - Level 3 - Auction rate security - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance as of beginning of period | $ 1,571 | $ 2,571 | $ 1,571 | $ 2,625
Sales and settlements at par | 0 | (1,000) | 0 | (1,000)
Total unrealized loss included in other comprehensive income | 0 | 0 | 0 | (54)
Balance as of the end of the period | $ 1,571 | $ 1,571 | $ 1,571 | $ 1,571

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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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