SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ADOPTED AND RECENTLY ISSUED ACCOUNTING STANDARDS - Recently Adopted Accounting Standards (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated (losses) earnings	$ (65,747)		$ (89,898)
Increase (decrease) fair value of equity securities	(6,800)
Carrying value of equity securities	$ 16,000		$ 19,200
Contango
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investment shares owned (in shares)	809,744
Rubicon
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investment shares owned (in shares)	3,597,823
ASU 2016-01 | Retrospective Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated (losses) earnings		$ 1,200