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Segment Information
 12 Months Ended
Sep. 30, 2021
Segment Reporting [Abstract]  
Segment Information Segment Information
We manage our business as one reportable operating segment related to the development, design, manufacturing and servicing of custom-engineered equipment and systems for the distribution, control and monitoring of electrical energy.
Revenues by country represent sales to unaffiliated customers as determined by the ultimate destination of our products and services, summarized for the last three fiscal years by region in the table below (in thousands):
 Year Ended September 30,
 202120202019
United States$351,422 $397,983 $406,609 
Canada68,655 66,064 64,326 
Middle East and Africa26,615 18,162 18,420 
Asia/Pacific8,889 18,079 11,405 
Europe13,027 15,866 13,746 
Mexico, Central and South America1,951 2,345 2,674 
Total revenues$470,559 $518,499 $517,180 

Long-lived assets by country consist of property, plant and equipment, net of accumulated depreciation and are determined based on the location of the tangible assets, summarized for the last two fiscal years in the table below (in thousands):
 September 30,
 20212020
Long-lived assets:  
United States$62,308 $67,071 
Canada42,375 42,580 
United Kingdom4,774 4,721 
Total$109,457 $114,372