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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Fair Value Disclosures [Abstract]          
Assets, Level 1 to Level 2 transfers $ 0   $ 0   $ 0
Liabilities, Level 1 to Level 2 transfers 0   0   0
Assets, Level 2 to Level 1 transfers 0   0   0
Liabilities, Level 2 to Level 1 transfers 0   0   $ 0
Asset transfers into Level 3 0 $ 0 0 $ 0  
Liability transfers into Level 3 0 0 0 0  
Asset transfers out of Level 3 0 0 0 0  
Liability transfers out of Level 3 $ 0 $ 0 $ 0 $ 0