Fair Value Measurements - Schedule of Assets or Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Nov. 30, 2019	Aug. 31, 2019
Assets:
Cash equivalents	$ 196,615	$ 214,038
Pension plan assets	4,309	4,603
Foreign currency forward contracts	250	254
Total assets at fair value	201,174	218,895
Level 1
Assets:
Cash equivalents	196,615	214,038
Pension plan assets	0	0
Foreign currency forward contracts	0	0
Total assets at fair value	196,615	214,038
Level 2
Assets:
Cash equivalents	0	0
Pension plan assets	4,309	4,603
Foreign currency forward contracts	250	254
Total assets at fair value	4,559	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