Revenue Recognition (Summary of Impacts of ASU on Condensed Consolidated Balance Sheet) (Details) - USD ($) $ in Thousands	Feb. 28, 2019	Sep. 01, 2018	Aug. 31, 2018	Feb. 28, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Inventories, net	$ 99,984		$ 79,233	$ 102,975
Other current assets	18,196		7,204	6,092
Other current liabilities	44,825		46,935	57,720
Deferred income tax liabilities	991		1,083	1,179
Retained earnings	477,027		484,886	$ 476,091
ASC Topic 606 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Inventories, net		$ 78,291
Other current assets		8,855
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	3,734		(942)
Other current assets	(1,157)		1,651
Other current liabilities	5,503		14
Deferred income tax liabilities			163
Retained earnings	(2,926)		$ 532
Balance Without Adoption of ASC Topic 606 [Member] | ASC Topic 606 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Inventories, net	103,718
Other current assets	17,039
Other current liabilities	50,328
Retained earnings	$ 474,101