Accounts Receivable (Tables)

3 Months Ended

Oct. 31, 2023

Receivables [Abstract]

Accounts receivable

Accounts receivable consist of the following at:

	October 31, 2023		July 31, 2023
Receivables from commercial and international customers	$	53,001,000	52,438,000
Unbilled receivables from commercial and international customers	68,474,000		54,469,000
Receivables from the U.S. government and its agencies	19,269,000		31,149,000
Unbilled receivables from the U.S. government and its agencies	46,239,000		27,192,000
Total accounts receivable	186,983,000		165,248,000
Less allowance for doubtful accounts	1,918,000		2,089,000
Accounts receivable, net	$	185,065,000	163,159,000