Consolidated Condensed Statements of Earnings - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Income Statement [Abstract]
Net sales	$ 765,277	$ 718,811	$ 1,520,120	$ 1,398,487
Cost of sales	557,223	521,410	1,100,809	1,001,584
Gross profit	208,054	197,401	419,311	396,903
Research and development	26,688	31,344	54,896	63,220
Selling, general and administrative	107,251	99,860	205,618	196,186
Interest	10,251	9,939	20,483	19,621
Other	2,333	2,342	9,879	7,477
Earnings before income taxes	61,531	53,916	128,435	110,399
Income taxes	11,786	12,857	28,663	26,571
Net earnings	$ 49,745	$ 41,059	$ 99,772	$ 83,828
Net earnings per share
Basic	$ 1.49	$ 1.18	$ 2.94	$ 2.41
Diluted	1.48	1.17	2.91	2.38
Dividends declared per share	$ 0.25	$ 0.25	$ 0.50	$ 0.50
Average common shares outstanding
Basic	33,434,420	34,886,541	33,972,635	34,850,898
Diluted	33,685,395	35,241,113	34,236,399	35,183,471