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Business Segments And Foreign Operations (Schedule Of Net Sales By Product Group) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Revenue from External Customer [Line Items]
Net sales	$ 488,109	$ 408,498	$ 423,350
Maintenance Products [Member]
Revenue from External Customer [Line Items]
Net sales	448,817	369,444	386,644
Homecare And Cleaning Products [Member]
Revenue from External Customer [Line Items]
Net sales	$ 39,292	$ 39,054	$ 36,706

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