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Employee Benefit Plans (Details) - USD ($)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Multiemployer Plans [Line Items]
Contributions to other multiemployer plans	$ 3,653,000	$ 8,000,000	$ 13,703,000
Total contributions made	$ 15,369,000	37,403,000	64,386,000
Boilermaker-Blacksmith National Pension Trust [Member]
Multiemployer Plans [Line Items]
EIN/Pension Plan Number	48-6168020/001
FIP/RP Status Pending or Implemented	Implemented
Multiemployer Plan, Employer Contribution, Cost	$ 4,003,000	$ 6,634,000	12,434,000
Surcharge Imposed	No
Multiemployer Plans, Underfunded Status, Description	Yellow	Yellow
Joint Pension Fund Local Union One Six Four Ibew [Domain]
Multiemployer Plans [Line Items]
EIN/Pension Plan Number	22-6031199/001
FIP/RP Status Pending or Implemented	Implemented
Multiemployer Plan, Employer Contribution, Cost	$ 1,958,000	$ 1,560,000	2,180,000
Surcharge Imposed	No
Multiemployer Plans, Underfunded Status, Description	Described below (1)	Described below (1)
Joint Pension Fund Local Union Number 102 IBEW [Member] [Domain]
Multiemployer Plans [Line Items]
EIN/Pension Plan Number	22-1615726/001
FIP/RP Status Pending or Implemented	NA
Multiemployer Plan, Employer Contribution, Cost	$ 1,341,000	$ 1,227,000	1,610,000
Surcharge Imposed	No
Multiemployer Plans, Underfunded Status, Description	Described below (1)	Green
IBEW Local 456 Pension Plan [Member] [Domain]
Multiemployer Plans [Line Items]
EIN/Pension Plan Number	22-6238995/001
FIP/RP Status Pending or Implemented	NA
Multiemployer Plan, Employer Contribution, Cost	$ 595,000	$ 427,000	574,000
Surcharge Imposed	No
Multiemployer Plans, Underfunded Status, Description	Green	Green
Local 351 IBEW Pension Plan [Member]
Multiemployer Plans [Line Items]
EIN/Pension Plan Number	22-3417366/001
FIP/RP Status Pending or Implemented	NA
Multiemployer Plan, Employer Contribution, Cost	$ 479,000	$ 1,709,000	2,025,000
Surcharge Imposed	No
Multiemployer Plans, Underfunded Status, Description	Described below (1)	Green
Steamfitters Local Union Number 420 Pension Plan [Member] [Domain]
Multiemployer Plans [Line Items]
EIN/Pension Plan Number	23-2004424/001
FIP/RP Status Pending or Implemented	Implemented
Multiemployer Plan, Employer Contribution, Cost	$ 442,000	$ 1,523,000	639,000
Surcharge Imposed	Yes
Multiemployer Plans, Underfunded Status, Description	Described below (1)	Red
IBEW Local Union 98 Pension Plan [Member]
Multiemployer Plans [Line Items]
EIN/Pension Plan Number	23-1990722/001
FIP/RP Status Pending or Implemented	Implemented
Multiemployer Plan, Employer Contribution, Cost	$ 195,000	$ 352,000	828,000
Surcharge Imposed	Yes
Multiemployer Plans, Underfunded Status, Description	Red	Red
Indiana Laborers Pension Fund [Domain]
Multiemployer Plans [Line Items]
EIN/Pension Plan Number	35-6027150/001
FIP/RP Status Pending or Implemented	NA
Multiemployer Plan, Employer Contribution, Cost	$ 20,000	$ 1,604,000	3,349,000
Surcharge Imposed	No
Multiemployer Plans, Underfunded Status, Description	Described below (1)	Green
Ironworkers Mid-America Pension Plan, Local 395 [Member]
Multiemployer Plans [Line Items]
EIN/Pension Plan Number	36-6488227/001
FIP/RP Status Pending or Implemented	NA
Multiemployer Plan, Employer Contribution, Cost	$ 0	$ 840,000	2,596,000
Surcharge Imposed	No
Multiemployer Plans, Underfunded Status, Description	Described below (1)	Green
Pipefitters Retirement Fund, Local 597 [Member]
Multiemployer Plans [Line Items]
EIN/Pension Plan Number	62-6105084/001
FIP/RP Status Pending or Implemented	NA
Multiemployer Plan, Employer Contribution, Cost	$ 0	$ 835,000	3,469,000
Surcharge Imposed	No
Multiemployer Plans, Underfunded Status, Description	Green	Green
Iron Workers Pension Plan of Western Pennsylvania, Local 3 [Member]
Multiemployer Plans [Line Items]
EIN/Pension Plan Number	25-1283169/001
FIP/RP Status Pending or Implemented	Implemented
Multiemployer Plan, Employer Contribution, Cost	$ 0	$ 500,000	2,317,000
Surcharge Imposed	No
Multiemployer Plans, Underfunded Status, Description	Described below (1)	Described below (1)
Iron Workers Pension Plan, Loc. 55 [Member]
Multiemployer Plans [Line Items]
EIN/Pension Plan Number	34-6682351/001
FIP/RP Status Pending or Implemented	NA
Multiemployer Plan, Employer Contribution, Cost	$ 0	$ 2,951,000	4,333,000
Surcharge Imposed	No
Multiemployer Plans, Underfunded Status, Description	Described below (1)	Green
National Electrical Benefit Fund, Local 488 and 126 [Member]
Multiemployer Plans [Line Items]
EIN/Pension Plan Number	53-0181657/001
FIP/RP Status Pending or Implemented	NA
Multiemployer Plan, Employer Contribution, Cost	$ 1,865,000	$ 2,674,000	5,893,000
Surcharge Imposed	No
Multiemployer Plans, Underfunded Status, Description	Described below (1)	Green
Connecticut Plumbers and Pipefitters Pension Fund, Local 777 [Member]
Multiemployer Plans [Line Items]
EIN/Pension Plan Number	06-6050353/001
FIP/RP Status Pending or Implemented	NA
Multiemployer Plan, Employer Contribution, Cost	$ 0	$ 0	3,307,000
Surcharge Imposed	No
Multiemployer Plans, Underfunded Status, Description	Green	Green
Northwestern Ohio Plumbers and Pipe Fitters Local 50 [Member]
Multiemployer Plans [Line Items]
EIN/Pension Plan Number	34-6502487/001
FIP/RP Status Pending or Implemented	NA
Multiemployer Plan, Employer Contribution, Cost	$ 0	$ 2,504,000	1,161,000
Surcharge Imposed	No
Multiemployer Plans, Underfunded Status, Description	Described below (1)	Green
OhioCarpentersPensionFundLocal1090and351
Multiemployer Plans [Line Items]
EIN/Pension Plan Number	34-6574360/001
FIP/RP Status Pending or Implemented	Implemented
Multiemployer Plan, Employer Contribution, Cost	$ 0	$ 3,042,000	2,962,000
Surcharge Imposed	Yes
Multiemployer Plans, Underfunded Status, Description	Described below (1)	Red
IBEW Local 654 Pension Plan
Multiemployer Plans [Line Items]
EIN/Pension Plan Number	23-6538183/001
FIP/RP Status Pending or Implemented	NA
Multiemployer Plan, Employer Contribution, Cost	$ 818,000	$ 1,021,000	$ 1,006,000
Surcharge Imposed	No
Multiemployer Plans, Underfunded Status, Description	Described below (1)	Green

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