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Revenue (Tables)
 9 Months Ended
Mar. 31, 2021
Contract with Customer, Asset and Liability [Abstract]  
Contract with Customer, Asset and Liability [Table Text Block] The following table provides information about CIE and BIE:
March 31,
2021		June 30,
2020		Change
 (in thousands)
Costs and estimated earnings in excess of billings on uncompleted contracts$37,964 $59,548 $(21,584)
Billings on uncompleted contracts in excess of costs and estimated earnings(59,495)(63,889)4,394 
Net contract liabilities$(21,531)$(4,341)$(17,190)
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue [Table Text Block]
Contract Type Disaggregation:
 Three Months EndedNine Months Ended
 March 31,
2021		March 31,
2020		March 31,
2021		March 31,
2020
 (In thousands)
Fixed-price contracts$96,412 $182,282 $343,639 $533,375 
Time and materials and other cost reimbursable contracts51,848 66,045 154,860 371,726 
Total Revenue$148,260 $248,327 $498,499 $905,101 
Revenue from External Customers by Geographic Areas The following series of tables presents revenue disaggregated by geographic area where the work was performed and by contract type:
Geographic Disaggregation:
 Three Months EndedNine Months Ended
 March 31,
2021		March 31,
2020		March 31,
2021		March 31,
2020
 (In thousands)
United States$138,001 $232,606 $445,578 $838,371 
Canada8,930 12,633 47,673 58,506 
Other international1,329 3,088 5,248 8,224 
Total Revenue$148,260 $248,327 $498,499 $905,101