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Accounts Receivable (Tables)
6 Months Ended
Jan. 31, 2024
Receivables [Abstract]  
Accounts receivable
Accounts receivable consist of the following at:
 January 31, 2024July 31, 2023
Receivables from commercial and international customers$53,581,000 52,438,000 
Unbilled receivables from commercial and international customers75,935,000 54,469,000 
Receivables from the U.S. government and its agencies9,846,000 31,149,000 
Unbilled receivables from the U.S. government and its agencies61,580,000 27,192,000 
Total accounts receivable200,942,000 165,248,000 
Less allowance for doubtful accounts2,394,000 2,089,000 
Accounts receivable, net$198,548,000 163,159,000