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Accounts Receivable (Tables)
3 Months Ended
Oct. 31, 2024
Receivables [Abstract]  
Accounts receivable
Accounts receivable consist of the following at:
 October 31, 2024July 31, 2024
Receivables from commercial and international customers$56,824,000 53,108,000 
Unbilled receivables from commercial and international customers73,896,000 72,540,000 
Receivables from the U.S. government and its agencies31,747,000 20,682,000 
Unbilled receivables from the U.S. government and its agencies37,772,000 51,197,000 
Total accounts receivable200,239,000 197,527,000 
Less allowance for doubtful accounts19,375,000 1,932,000 
Accounts receivable, net$180,864,000 195,595,000