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Revenue (Tables)
 6 Months Ended
Dec. 31, 2020
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:
December 31,
2020		June 30,
2020		Change
 (in thousands)
Costs and estimated earnings in excess of billings on uncompleted contracts$41,398 $59,548 $(18,150)
Billings on uncompleted contracts in excess of costs and estimated earnings(62,244)(63,889)1,645 
Net contract liabilities$(20,846)$(4,341)$(16,505)
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue [Table Text Block]
Contract Type Disaggregation:
 Three Months EndedSix Months Ended
 December 31,
2020		December 31,
2019		December 31,
2020		December 31,
2019
 (In thousands)
Fixed-price contracts$113,871 $174,773 $247,227 $351,093 
Time and materials and other cost reimbursable contracts53,597 143,904 103,012 305,681 
Total Revenue$167,468 $318,677 $350,239 $656,774 
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 EndedSix Months Ended
 December 31,
2020		December 31,
2019		December 31,
2020		December 31,
2019
 (In thousands)
United States$146,200 $291,348 $307,577 $605,765 
Canada19,132 24,703 38,743 45,872 
Other international2,136 2,626 3,919 5,137 
Total Revenue$167,468 $318,677 $350,239 $656,774