CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Statement of Financial Position [Abstract]
Accounts receivable, net allowances	$ 17,758	$ 7,881
Contract costs, net of progress payments	$ 24,175	$ 11,259
Preferred stock, par value (in dollars per share)	$ 0.25	$ 0.25
Preferred stock, share authorized (in shares)	3,000,000	3,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.25	$ 0.25
Common stock, share authorized (in shares)	85,000,000	85,000,000
Common stock, shares issued (in shares)	83,739,000	82,775,000
Treasury shares (in shares)	27,610,000	35,969,000