Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Deferred tax assets:
State and foreign credits	$ 6,684	$ 4,922
Net operating loss carryforwards	4,511	1,200
Contract assets and costs	(182,809)	(158,538)
Deferred revenue	3,876	4,596
Other reserves and accruals	8,663	7,465
Intangible assets	957	982
Property, leasehold improvements, and other basis differences	5,202	5,514
Other temporary differences	452	925
Deferred tax assets, total	30,345	25,604
Deferred tax liabilities:
Deferred revenue	(15,944)	(27,066)
Intangible assets	(7,795)	(6,815)
Property, leasehold improvements, and other basis differences	(5,122)	(5,223)
Deferred tax liabilities, gross	211,670	197,642
Deferred tax liabilities, total	(191,239)	(178,243)
Valuation allowance	$ (9,914)	$ (6,205)