Business Combinations - Additional Information (Detail) (USD $)				0 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Apr. 01, 2014 InfoCentricity	Apr. 01, 2014 InfoCentricity	Sep. 30, 2013 Cr Software LLC	Sep. 30, 2013 Infoglide Software Inc	Sep. 30, 2012 Adeptra Ltd	Sep. 30, 2012 Entiera, Inc
Business Acquisition [Line Items]
Common stock acquired					100.00%	100.00%	100.00%	100.00%	100.00%
Cash consideration				$ 8,200,000		$ 29,600,000	$ 4,400,000	$ 113,000,000	$ 18,400,000
Intangible assets acquired						16,500,000		36,700,000	2,500,000
Weighted average useful life						8 years 9 months 17 days		6 years 7 months	4 years 1 month 5 days
Goodwill	$ 779,928,000	$ 773,931,000	$ 757,504,000			$ 13,700,000		$ 72,200,000	$ 15,000,000