Segment Information - Long-lived Assets by Geographic Areas (Details) - USD ($) $ in Thousands	Aug. 31, 2020	Aug. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 382,031	$ 119,384
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	205,929	86,238
Philippines
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	53,124	4,188
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	42,923	15,051
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	32,184	5,347
All Other Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 47,871	$ 8,560