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Revenue (Tables)
 3 Months Ended
Sep. 30, 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:
September 30,
2020		June 30,
2020		Change
 (in thousands)
Costs and estimated earnings in excess of billings on uncompleted contracts$57,694 $59,548 $(1,854)
Billings on uncompleted contracts in excess of costs and estimated earnings(63,523)(63,889)366 
Net contract liabilities$(5,829)$(4,341)$(1,488)
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue [Table Text Block]
Contract Type Disaggregation:
 Three Months Ended
 September 30,
2020		September 30,
2019
 (In thousands)
Fixed-price contracts$133,356 $176,320 
Time and materials and other cost reimbursable contracts49,415 161,777 
Total Revenue$182,771 $338,097 
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 Ended
 September 30,
2020		September 30,
2019
 (In thousands)
United States$161,377 $314,416 
Canada19,611 21,170 
Other international1,783 2,511 
Total Revenue$182,771 $338,097