Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Deferred tax assets:
Loss and credit carryforwards	$ 26,702	$ 24,377
Compensation benefits	23,931	30,388
Other assets	9,393	10,735
Deferred tax assets, gross	60,026	65,500
Less valuation allowance	(19,231)	(19,564)
Total deferred tax assets	40,795	45,936
Deferred tax liabilities:
Intangible assets	(15,114)	(15,921)
Deferred Commission	(7,920)	(6,368)
Property and equipment	(3,511)	(2,616)
Other liabilities	(8,244)	(7,226)
Total deferred tax liabilities	(34,789)	(32,131)
Deferred tax assets, net	$ 6,006	$ 13,805