Debt - Narrative (Details) - USD ($)	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Aug. 18, 2015
Line Of Credit Facility [Line Items]
Revolving credit facility outstanding amount	$ 30,500,000
Amortization of financing fees	$ 326,000	$ 462,000	$ 595,000
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Term of credit facility (in years)	5 years
Maximum borrowing capacity				$ 180,000,000
Revolving credit facility maturity date	Aug. 18, 2020
Availability to be maintained under credit facility				$ 12,500,000
Availability to be maintained under credit facility before restriction on investments, percentage				20.00%
Covenant terms	The Revolving Credit Facility requires that we satisfy a fixed charge coverage ratio at any time that our availability is less than the greater of 10% of our calculated borrowing base or $12.5 million.
Revolving credit facility outstanding amount	$ 30,500,000
Outstanding letters of credit	6,000,000
Availability under the credit facility	$ 64,200,000
Frequency of commitment fee payment	Payable quarterly
Revolving credit facility, description of variable rate basis	One month LIBOR
Interest expense	$ 1,500,000	1,100,000
Commitment fees	400,000	600,000
Interest expense, debt	700,000
Amortization of financing fees	$ 400,000	$ 500,000
Revolving Credit Facility | Minimum
Line Of Credit Facility [Line Items]
Availability to be maintained under credit facility, percentage				10.00%
Revolving Credit Facility | Maximum
Line Of Credit Facility [Line Items]
Commitment fees (as a percent)	0.25%