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Implementation of the New Revenue Recognition Standard (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	Oct. 01, 2018	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition
Retained earnings	$ 821,668	$ 862,948				$ 801,834				$ 862,948	$ 801,834
Net sales		$ 471,198	$ 382,679	$ 337,339	$ 305,259	$ 379,709	$ 296,212	$ 278,586	$ 248,391	$ 1,496,475	$ 1,202,898	$ 1,107,709
ASU 2014-09 \| Adjustments
Revenue, Initial Application Period Cumulative Effect Transition
Retained earnings	24,500
Net sales	114,900
Cost of Goods Sold	$ 90,400