Revenue Recognition (Tables)

6 Months Ended

Mar. 31, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

By operating segment and service

	Three Months Ended March 31,				Six Months Ended March 31,
(dollars in thousands)	2020		2019		2020		2019
Program administration	$	236,436	$	219,732	$	473,343	$	438,705
Assessments and appeals	29,916		33,331		63,747		70,552
Workforce and children services	28,734		23,898		58,120		47,801
Other	13,612		13,776		25,769		27,892
Total U.S. Health and Human Services	$	308,698	$	290,737	$	620,979	$	584,950
Program administration	$	304,367	$	209,996	$	586,055	$	350,117
Technology solutions	44,508		37,993		88,114		76,876
Assessments and appeals	44,516		41,747		85,793		79,730
Total U.S. Federal Services	$	393,391	$	289,736	$	759,962	$	506,723
Workforce and children services	$	34,683	$	69,759	$	91,922	$	143,037
Assessments and appeals	62,286		67,771		124,929		130,081
Program administration	16,945		15,922		34,039		31,242
Other	2,132		2,595		4,533		5,106
Total Outside the U.S.	$	116,046	$	156,047	$	255,423	$	309,466
Total revenue	$	818,135	$	736,520	$	1,636,364	$	1,401,139

By contract type

	Three Months Ended March 31,				Six Months Ended March 31,
(dollars in thousands)	2020		2019		2020		2019
Performance-based	$	275,669	$	261,592	$	568,427	$	574,479
Cost-plus	398,973		298,133		761,784		473,431
Fixed price	100,504		139,871		219,720		287,022
Time and materials	42,989		36,924		86,433		66,207
Total revenue	$	818,135	$	736,520	$	1,636,364	$	1,401,139

By customer type

	Three Months Ended March 31,				Six Months Ended March 31,
(dollars in thousands)	2020		2019		2020		2019
New York State government agencies	$	100,222	$	89,858	$	197,445	$	181,570
Other U.S. state government agencies	217,195		197,870		427,081		396,772
Total U.S. state government agencies	317,417		287,728		624,526		578,342
United States Federal Government agencies	374,909		270,623		726,742		468,901
International government agencies	107,460		146,292		238,276		289,073
Other, including local municipalities and commercial customers	18,349		31,877		46,820		64,823
Total revenue	$	818,135	$	736,520	$	1,636,364	$	1,401,139

By geography

	Three Months Ended March 31,				Six Months Ended March 31,
(dollars in thousands)	2020		2019		2020		2019
United States of America	$	702,089	$	580,473	$	1,380,941	$	1,091,673
United Kingdom	63,722		78,334		136,724		151,752
Australia	24,540		50,997		61,975		104,370
Rest of world	27,784		26,716		56,724		53,344
Total revenue	$	818,135	$	736,520	$	1,636,364	$	1,401,139

Deferred Contract Cost

	Three Months Ended March 31,				Six Months Ended March 31,
(dollars in thousands)	2020		2019		2020		2019
Deferred contract cost capitalization	$	2,666	$	5,113	$	3,995	$	8,212
Deferred contract cost amortization	1,321		1,478		3,497		2,820