Revenue Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Revenue, Performance Obligation [Abstract]
Costs in Excess of Billings, Current	$ 96,083	$ 76,632
Performance obligations to be recognized as revenue within next twelve months	656,400
Revenue, Remaining Performance Obligation, Amount	823,300
Contract with Customer, Asset and Liability [Abstract]
Change in CIE	19,451
Billings on uncompleted contracts in excess of costs and estimated earnings	(105,626)	(120,740)
Change in BIE	15,114
Change in net contract balances	34,565
Contract with Customer, Liability, Revenue Recognized	120,700
Disclosure Customer Contracts Additional Information [Abstract]
Costs incurred and estimated earnings on uncompleted contracts	1,942,903	2,081,799
Billings on uncompleted contracts	1,952,446	2,125,907
Net contract liabilities	(9,543)	(44,108)
Contract Receivable Retainage, Next Twelve Months	21,900	25,900
Contract Receivable Retainage, after Next Twelve Months	17,700	2,600
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customers	1,416,680	1,091,553	$ 1,197,509
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customers	1,367,844	981,292	961,049
CANADA
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customers	41,410	104,208	228,625
Other international [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customers	$ 7,426	$ 6,053	$ 7,835