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Revenue Recognition (Schedule of Disaggregation of Revenue by Segment) (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Disaggregation Of Revenue [Line Items]    
Revenue from the contracts with customers $ 104,447 $ 106,614
Lease revenue 4,038 2,779
Total operating revenues 108,485 109,393
Irrigation [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from the contracts with customers 87,356 83,327
Lease revenue 0 0
Total operating revenues 87,356 83,327
Infrastructure [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from the contracts with customers 17,091 23,287
Lease revenue 4,038 2,779
Total operating revenues 21,129 26,066
Point in Time [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from the contracts with customers 95,512 94,980
Point in Time [Member] | Irrigation [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from the contracts with customers 80,060 73,818
Point in Time [Member] | Infrastructure [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from the contracts with customers 15,452 21,162
Over Time [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from the contracts with customers 8,935 11,634
Over Time [Member] | Irrigation [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from the contracts with customers 7,296 9,509
Over Time [Member] | Infrastructure [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from the contracts with customers $ 1,639 $ 2,125