Variable Interest Entity (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 25, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Oct. 01, 2013
Variable Interest Entity [Line Items]
Payments to Acquire Interest in Subsidiaries and Affiliates	$ 90,000	$ 0	$ 0	$ 17,000
Current assets:
Restricted investments		5,959,000	6,701,000
Total current assets		248,245,000	234,303,000
Property, Plant and Equipment, Net		22,460,000	13,709,000
Other assets		18,383,000	5,303,000
Total assets		478,478,000	362,881,000
Long-term environmental remediation liabilities		433,000	489,000
Total liabilities		325,663,000	214,966,000
Financial support given		4,070,000
Variable Interest Entity, Primary Beneficiary
Current assets:
Restricted investments			63,000
Total current assets			63,000
Property, Plant and Equipment, Net			0
Other assets			4,344,000
Total assets			4,407,000
Long-term environmental remediation liabilities			21,000
Total liabilities			$ 21,000
Subordinated Debt | CAH note payable | Variable Interest Entity, Primary Beneficiary
Current assets:
Subordinated Long-term Debt, Noncurrent					$ 2,448,000
Willbros Engineers LLC | Variable Interest Entity, Primary Beneficiary
Current assets:
Cash and cash equivalents		306,000
Accounts receivable		739,000
Other current liabilities		6,000
Financial support given		$ 98,000