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Non-controlling interest (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Noncontrolling Interest [Line Items]
Common unit, outstanding (in shares)	21,598,534.000				19,198,314.000				21,598,534.000	19,198,314.000
Ownership percentage	100.00%				100.00%				100.00%	100.00%
Noncontrolling Interest [Roll Forward]
Beginning balance				$ 4,941				$ 4,679	$ 4,941	$ 4,679
Allocation of income to non-controlling LLC Unit holders for period	$ 904	$ 1,124	$ 799	$ 529	$ 602	$ 833	$ 836	$ 446	3,356	2,717	$ 2,253
Distributions paid and payable to non-controlling LLC Unit holders for period									(1,852)	(1,535)
Reallocation of non-controlling interest									(943)	(920)
Ending balance	$ 5,502				$ 4,941				$ 5,502	4,941	4,679
Common units, canceled (in shares)									14,821
Tax distributions payable to non-controlling LLC Unit holders									$ 511	$ 309	341
Class A Common Stock
Noncontrolling Interest [Roll Forward]
Shares issued during period (in shares)									2,632,482
Non-controlling Interest in LLC
Noncontrolling Interest [Line Items]
Common unit, outstanding (in shares)	1,043,186				1,260,627				1,043,186	1,260,627
Ownership percentage	4.80%				6.60%				4.80%	6.60%
Noncontrolling Interest [Roll Forward]
Tax distributions payable to non-controlling LLC Unit holders									$ 511	$ 309
Distribution paid to noncontrolling interests									$ 1,647	$ 1,226	$ 1,239
Parent
Noncontrolling Interest [Line Items]
Common unit, outstanding (in shares)	20,555,348				17,937,687				20,555,348	17,937,687
Ownership percentage	95.20%				93.40%				95.20%	93.40%

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