Summary of Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Mar. 31, 2012		Mar. 31, 2011		Mar. 31, 2012		Mar. 31, 2011
Segment revenues:
Transactional and maintenance	$ 114,843		$ 111,431		$ 229,026		$ 226,193
Professional services	30,461		27,041		59,154		54,949
License	14,217		14,352		41,690		27,613
Total segment revenues	159,521		152,824		329,870		308,755
Segment operating expense	(115,208)		(116,006)		(226,798)		(235,469)
Segment operating income	44,313		36,818		103,072		73,286
Unallocated share-based compensation expense	(4,627)		(4,171)		(9,384)		(8,205)
Unallocated amortization expense	(1,490)	[1]	(1,933)	[1]	(3,420)	[1]	(3,862)	[1]
Unallocated restructuring expense			(11,522)				(12,391)
Operating income	38,196		19,192		90,268		48,828
Unallocated interest income	106		57		194		161
Unallocated interest expense	(7,984)		(8,137)		(15,971)		(16,378)
Unallocated other expense, net	(634)		(78)		(1,182)		(154)
Income before income taxes	29,684		11,034		73,309		32,457
Depreciation expense	3,031		4,382		6,629		8,908
Applications
Segment revenues:
Transactional and maintenance	63,523		64,102		127,795		130,699
Professional services	25,756		23,486		50,083		48,235
License	6,855		8,348		28,472		14,638
Total segment revenues	96,134		95,936		206,350		193,572
Segment operating expense	(70,033)		(72,262)		(140,123)		(146,749)
Segment operating income	26,101		23,674		66,227		46,823
Depreciation expense	2,385		3,431		5,180		6,921
Scores
Segment revenues:
Transactional and maintenance	43,636		39,894		85,833		80,399
Professional services	521		730		809		969
License	268		336		325		407
Total segment revenues	44,425		40,960		86,967		81,775
Segment operating expense	(13,103)		(15,262)		(26,398)		(30,513)
Segment operating income	31,322		25,698		60,569		51,262
Depreciation expense	172		271		392		551
Tools
Segment revenues:
Transactional and maintenance	7,684		7,435		15,398		15,095
Professional services	4,184		2,825		8,262		5,745
License	7,094		5,668		12,893		12,568
Total segment revenues	18,962		15,928		36,553		33,408
Segment operating expense	(14,567)		(13,057)		(29,908)		(28,147)
Segment operating income	4,395		2,871		6,645		5,261
Depreciation expense	269		406		642		912
Unallocated Corporate Expenses
Segment revenues:
Segment operating expense	(17,505)		(15,425)		(30,369)		(30,060)
Segment operating income	(17,505)		(15,425)		(30,369)		(30,060)
Depreciation expense	$ 205		$ 274		$ 415		$ 524

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