Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021
Revenue, Performance Obligation [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 365,400
Performance obligations to be recognized as revenue within next twelve months	302,200
Contract with Customer, Asset and Liability [Abstract]
Costs and estimated earnings in excess of billings on uncompleted contracts	33,766		$ 30,774
Change in CIE	2,992
Billings on uncompleted contracts in excess of costs and estimated earnings	(50,973)		(53,832)
Change in BIE	2,859
Change in net contract balances	5,851
Contract with customer, current liability, net	(17,207)		(23,058)
Contract with Customer, Liability, Revenue Recognized	44,300
Disclosure Customer Contracts Additional Information [Abstract]
Construction Contractor, Receivable, Retainage, Year One	12,800		19,900
Construction Contractor, Receivable, Retainage, after Year One	2,600		$ 3,100
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer	168,093	$ 182,771
Loss on Contracts	5,900
Fixed-price Contract
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer	102,065	133,356
Time-and-materials Contract
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer	66,028	49,415
United States
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer	153,284	161,377
Canada
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer	13,510	19,611
Other international
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer	$ 1,299	$ 1,783