Quarterly Financial Information (Unaudited) (Schedule Of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Net sales	$ 153,612	$ 134,191	$ 128,941	$ 120,547	$ 151,413	$ 130,495	$ 124,762	$ 124,450	$ 537,291	$ 531,120	$ 490,079
Net earnings from continuing operations	12,983	10,748	7,982	10,023	12,927	11,590	9,264	8,832	41,736	42,613	31,260
Net (loss) earnings from discontinued operations	0	1,148	(372)	0	(1,619)	0	(42,941)	2,357	0	9,858	(56,863)
Net earnings (loss)	$ 12,983	$ 11,896	$ 7,610	$ 10,023	$ 11,308	$ 11,590	$ (33,677)	$ 11,189	$ 42,512	$ 410	$ (25,603)
Basic earnings (loss) per share:
Net earnings from continuing operations	$ 0.50	$ 0.41	$ 0.31	$ 0.38	$ 0.49	$ 0.44	$ 0.35	$ 0.33	$ 1.6	$ 1.61	$ 1.18
Net (loss) earnings from discontinued operations	0	0.04	(0.01)	0	(0.06)	0	(1.62)	0.09	0.03	(1.6)	(2.15)
Net earnings (loss)	0.50	0.45	0.30	0.38	0.43	0.44	(1.27)	0.42	1.63	0.01	(0.97)
Diluted earnings (loss) per share:
Net earnings from continuing operations	0.50	0.41	0.30	0.38	0.49	0.43	0.35	0.33	1.59	1.6	1.17
Net (loss) earnings from discontinued operations	0	0.04	(0.01)	0	(0.06)	0	(1.61)	0.09	0.03	(1.58)	(2.13)
Net earnings (loss)	0.50	0.45	0.29	0.38	0.43	0.43	(1.26)	0.42	1.62	0.02	(0.96)
Dividends declared per common share	$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.32	$ 0.32	$ 0.32