Revenue Recognition (Summary of Impacts of ASU on Condensed Consolidated Balance Sheet) (Details) - USD ($) $ in Thousands	Aug. 31, 2019	Sep. 01, 2018	Aug. 31, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Inventories, net	$ 92,287		$ 79,233
Other current assets	15,704		11,087
Other current liabilities	52,488		46,935
Deferred income tax liabilities	872		1,083
Retained earnings	474,740		484,886
ASC Topic 606 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Inventories, net		$ 78,291
Other current assets		12,738
Other current liabilities		46,949
Deferred income tax liabilities		1,246
Retained earnings		$ 485,418
ASC Topic 606 Adjustments [Member] | ASC Topic 606 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Inventories, net	3,729		(942)
Other current assets	(1,170)		1,651
Other current liabilities	5,711		14
Deferred income tax liabilities			163
Retained earnings	(3,153)		$ 532
Balance Without Adoption of ASC Topic 606 [Member] | ASC Topic 606 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Inventories, net	96,016
Other current assets	14,534
Other current liabilities	58,199
Retained earnings	$ 471,587