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Accounts Receivable (Tables)
12 Months Ended
Jul. 31, 2023
Receivables [Abstract]  
Accounts receivable
Accounts receivable consists of the following at July 31, 2023 and 2022:
 20232022
Receivables from commercial and international customers$52,438,000 59,922,000 
Unbilled receivables from commercial and international customers54,469,000 39,826,000 
Receivables from the U.S. government and its agencies31,149,000 24,776,000 
Unbilled receivables from the U.S. government and its agencies27,192,000 1,524,000 
Total accounts receivable165,248,000 126,048,000 
Less allowance for doubtful accounts2,089,000 2,337,000 
Accounts receivable, net$163,159,000 123,711,000