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Intangible Assets Including Goodwill (Tables)
 3 Months Ended
Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items]  
Schedule of Goodwill [Table Text Block]
The changes in the carrying value of goodwill by segment are as follows:
Utility and Power InfrastructureProcess and Industrial FacilitiesStorage and Terminal SolutionsTotal
 (In thousands)
Net balance at June 30, 2020$6,905 $26,846 $26,618 $60,369 
Translation adjustment(1)
21 7 40 68 
Net balance at September 30, 2020$6,926 $26,853 $26,658 $60,437 
(1)The translation adjustments relate to the periodic translation of Canadian Dollar and South Korean Won denominated goodwill recorded as a part of prior acquisitions in Canada and South Korea, in which the local currency was determined to be the functional currency.
Schedule Of Intangible Assets Excluding Goodwill Table [Text Block]
Information on the carrying value of other intangible assets is as follows:
  At September 30, 2020
  
Useful LifeGross Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount
 (Years)(In thousands)
Intellectual property10 to 15$2,558 $(1,979)$579 
Customer-based6 to 1517,062 (9,354)7,708 
Total amortizing intangible assets$19,620 $(11,333)$8,287 
 
  At June 30, 2020
 Useful LifeGross Carrying
Amount		Accumulated
Amortization		Net Carrying
Amount
 (Years)(In thousands)
Intellectual property10 to 15$2,579 $(1,956)$623 
Customer-based6 to 1521,840 (13,626)8,214 
Total amortizing intangible assets$24,419 $(15,582)$8,837 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Period ending:
Remainder of Fiscal 2021$1,679 
Fiscal 20221,812 
Fiscal 20231,729 
Fiscal 20241,416 
Fiscal 20251,096 
Fiscal 2026555 
Total estimated remaining amortization expense at September 30, 2020$8,287