Summary of Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2014		Mar. 31, 2013
Segment revenues:
Transactional and maintenance	$ 132,369		$ 126,439		$ 262,024		$ 256,337
Professional services	34,619		34,109		68,905		66,446
License	18,474		18,777		38,876		46,562
Total segment revenues	185,462		179,325		369,805		369,345
Segment operating expense	(146,725)		(146,119)		(295,798)		(293,145)
Unallocated share-based compensation expense	(9,051)		(6,413)		(16,286)		(12,245)
Unallocated amortization expense	(2,908)	[1]	(3,604)	[1]	(5,921)	[1]	(6,976)	[1]
Unallocated restructuring and acquisition-related					(3,660)		(3,289)
Operating income	38,737		33,206		74,007		76,200
Unallocated interest income	10		9		16		30
Unallocated interest expense	(7,109)		(7,855)		(14,241)		(15,735)
Unallocated other expense, net	(351)		27		(1,312)		(65)
Income before income taxes	31,287		25,387		58,470		60,430
Depreciation expense	4,937		4,856		10,091		9,457
Operating Segments
Segment revenues:
Segment operating expense	(134,766)		(136,102)		(269,931)		(270,635)
Operating income	50,696		43,223		99,874		98,710
Applications
Segment revenues:
Transactional and maintenance	76,898		76,012		154,677		155,637
Professional services	28,373		27,315		55,160		53,474
License	10,339		13,888		17,689		32,811
Total segment revenues	115,610		117,215		227,526		241,922
Depreciation expense	3,461		3,490		7,098		6,775
Applications | Operating Segments
Segment revenues:
Segment operating expense	(78,951)		(86,285)		(160,913)		(166,751)
Operating income	36,659		30,930		66,613		75,171
Scores
Segment revenues:
Transactional and maintenance	46,560		42,206		89,878		84,643
Professional services	777		1,624		1,366		2,527
License	521		232		3,794		339
Total segment revenues	47,858		44,062		95,038		87,509
Depreciation expense	198		223		410		439
Scores | Operating Segments
Segment revenues:
Segment operating expense	(10,939)		(12,934)		(21,314)		(25,480)
Operating income	36,919		31,128		73,724		62,029
Tools
Segment revenues:
Transactional and maintenance	8,911		8,221		17,469		16,057
Professional services	5,469		5,170		12,379		10,445
License	7,614		4,657		17,393		13,412
Total segment revenues	21,994		18,048		47,241		39,914
Depreciation expense	622		480		1,236		951
Tools | Operating Segments
Segment revenues:
Segment operating expense	(20,804)		(15,438)		(41,875)		(30,910)
Operating income	1,190		2,610		5,366		9,004
Unallocated Corporate Expenses
Segment revenues:
Depreciation expense	656		663		1,347		1,292
Unallocated Corporate Expenses | Operating Segments
Segment revenues:
Segment operating expense	(24,072)		(21,445)		(45,829)		(47,494)
Operating income	$ (24,072)		$ (21,445)		$ (45,829)		$ (47,494)

[1] Cost of revenues and selling, general and administrative expenses exclude the amortization of intangible assets. See Note 4 to the condensed consolidated financial statements.