Employee Benefit Plans - Schedule of Multi-Employer Pension Plans (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2019
Local 807 Pension Plan
Multiemployer Plans [Line Items]
Other Commitment	$ 182,000		$ 182,000
Multiemployer Plans, Pension
Multiemployer Plans [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	452,000	$ 283,000	880,000	$ 778,000
Multiemployer Plans, Pension | WCT Pension Trust
Multiemployer Plans [Line Items]
Other Commitment	344,000		344,000		$ 1,487,000
Multiemployer Plans, Pension | Local 807 Pension Plan
Multiemployer Plans [Line Items]
Multiemployer plan, quarterly installments for withdrawal liability			91,000
Defined Benefit Plan, Benefit Obligation, Payment for Settlement			3,000,000
Other Commitment, Due after Fifth Year	200,000		200,000
Multiemployer Plans, Pension | WCTPP
Multiemployer Plans [Line Items]
Multiemployer Plans, Withdrawal Obligation, Assessment	3,400,000		3,400,000
Multiemployer Plans, Pension | Employee-related | WCTPP
Multiemployer Plans [Line Items]
Multiemployer plan, quarterly installments for withdrawal liability			190,507
Defined Benefit Plan, Benefit Obligation, Payment for Settlement			153,822
Other Postretirement Benefit Plan
Multiemployer Plans [Line Items]
Defined Benefit Plan, Service Cost	147,000	133,000	294,000	266,000
Defined Benefit Plan, Interest Cost	214,000	222,000	428,000	444,000
Defined Benefit Plan, Amortization of Gain (Loss)	(125,000)	(209,000)	(250,000)	(418,000)
Amortization of prior service credit	(392,000)	(439,000)	(784,000)	(878,000)
Net periodic benefit cost	$ (156,000)	$ (293,000)	$ (312,000)	$ (586,000)
Postretirement Health Coverage
Multiemployer Plans [Line Items]
Discount rate			3.62%	4.25%
Postretirement Life Insurance
Multiemployer Plans [Line Items]
Discount rate			3.64%	4.25%