Fair Value Measurements - Schedule of Assets or Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Feb. 29, 2020	Aug. 31, 2019
Assets:
Cash equivalents	$ 195,996	$ 214,038
Pension plan assets	4,228	4,603
Foreign currency forward contracts	280	254
Total assets at fair value	200,504	218,895
Level 1
Assets:
Cash equivalents	195,996	214,038
Pension plan assets	0	0
Foreign currency forward contracts	0	0
Total assets at fair value	195,996	214,038
Level 2
Assets:
Cash equivalents	0	0
Pension plan assets	4,228	4,603
Foreign currency forward contracts	280	254
Total assets at fair value	4,508	4,857
Level 3
Assets:
Cash equivalents	0	0
Pension plan assets	0	0
Foreign currency forward contracts	0	0
Total assets at fair value	$ 0	$ 0