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Accounts Receivable (Tables)
 12 Months Ended
Jul. 31, 2025
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable
Accounts receivable consists of the following at July 31, 2025 and 2024:
 20252024
Receivables from commercial and international customers$57,713,000 53,108,000 
Unbilled receivables from commercial and international customers69,987,000 72,540,000 
Receivables from the U.S. government and its agencies15,610,000 20,682,000 
Unbilled receivables from the U.S. government and its agencies20,683,000 51,197,000 
Total accounts receivable163,993,000 197,527,000 
Less allowance for doubtful accounts19,156,000 1,932,000 
Accounts receivable, net$144,837,000 195,595,000