Business and Intangible Asset Acquisitions and Joint Ventures (Details) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2014	May 31, 2013	Oct. 01, 2012 Accelerate Payment Technologies [Member]	Oct. 01, 2012 Accelerate Payment Technologies [Member] Customer-Related Intangible Assets [Member]	Oct. 01, 2012 Accelerate Payment Technologies [Member] Contract-Based Intangible Assets [Member]	Oct. 01, 2012 Accelerate Payment Technologies [Member] Technology-Based Intangible Assets [Member]	Dec. 12, 2012 Banca Civica [Member]	Dec. 12, 2012 Banca Civica [Member] Customer-Related Intangible Assets [Member]	Dec. 12, 2012 Banca Civica [Member] Contract-Based Intangible Assets [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Goodwill	$ 1,064,868	$ 1,044,222	$ 308,518				$ 4,445
Acquired intangible assets				97,200	30,600	15,000		4,576	13,858
Fixed assets			1,309
Other assets			3,708
Total assets acquired			456,335
Deferred income taxes			(46,167)
Net assets acquired			$ 410,168				$ 22,879