Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 120,654	$ 133,386	$ 240,084	$ 280,060
Revenue Recognized at a Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	90,726	97,189	177,506	202,001
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 29,928	$ 36,197	$ 62,578	$ 78,059