Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Deferred tax assets:
State and foreign credits	$ 4,922	$ 4,055
Net operating loss carryforwards	1,200	906
Contract assets and costs	(158,538)	(147,619)
Deferred revenue	4,596	5,252
Other reserves and accruals	7,465	6,082
Intangible assets	982	1,020
Property, leasehold improvements, and other basis differences	5,514	1,433
Other temporary differences	925	453
Deferred tax assets, total	25,604	19,201
Deferred tax liabilities:
Deferred revenue	(27,066)	(8,610)
Intangible assets	(6,815)	(5,635)
Property, leasehold improvements, and other basis differences	(5,223)	(1,146)
Deferred tax liabilities, gross	197,642	163,010
Deferred tax liabilities, total	(178,243)	(148,675)
Valuation allowance	$ (6,205)	$ (4,866)