Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Unearned Revenue (Details)
Total Revenue	$ 94,713	$ 77,301	$ 178,970	$ 150,447
North America, primarily the United States
Unearned Revenue (Details)
Total Revenue	73,790	56,423	140,033	110,441
Europe, Middle East & Africa
Unearned Revenue (Details)
Total Revenue	14,715	11,690	24,874	22,226
Rest of world
Unearned Revenue (Details)
Total Revenue	6,208	9,188	14,063	17,780
Transferred at a point in time
Unearned Revenue (Details)
Total Revenue	72,656	69,144	139,191	133,332
Transferred over time
Unearned Revenue (Details)
Total Revenue	$ 22,057	$ 8,157	$ 39,779	$ 17,115