Leases (Supplemental Balance Sheet Information) (Details) - USD ($) $ in Thousands		Nov. 30, 2019		Aug. 31, 2019
Leases [Abstract]
Operating lease assets		$ 59,385
Finance lease assets	[1]	4,348		$ 2,958
Total leased assets		63,733		2,958
Current operating lease liabilities		21,039
Current finance lease liabilities		1,190		765
Noncurrent operating lease liabilities		37,977
Noncurrent finance lease liabilities		3,260		2,206
Total lease liabilities		$ 63,466	[2]	2,971
Weighted average remaining lease term (years), Operating leases		4 years
Weighted average remaining lease term (years), Finance leases		3 years 8 months 12 days
Weighted average discount rate, Operating leases		3.50%
Weighted average discount rate, Finance leases		2.60%
Finance lease right of use assets, Accumulated amortization		$ 473		$ 1,398

[1] Finance lease assets are net of accumulated amortization of $473 and $1,398 as of November 30, 2019 and August 31, 2019

[2] Includes the current portion of $21,039 for operating leases and $1,190 for finance leases