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Share-Based Compensation - Cash-Settled Phantom Units (Details) - Phantom Units - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Shares outstanding beginning period (in shares) 170,000 0 0
Shares granted (in shares) 0 170,000  
Shares vested (in shares) (170,000) 0  
Shares forfeited (in shares) 0 0  
Shares outstanding ending period (in shares) 0 170,000 0
Weighted average remaining contractual term, Outstanding   6 months  
Aggregate intrinsic value, Outstanding ending balance   $ 273  
Aggregate intrinsic value, Granted   68  
Aggregate intrinsic value, Vested   $ 1,619