Goodwill and Other Intangible Assets - Schedule of Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Aug. 31, 2012	May 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 5,365.5	$ 5,776.2
Impairment Charge		(503.8)
New Carrying Amount		5,272.4
Accumulated Amortization	(1,424.6)	(1,607.9)
Impairment Charge		265.9
Net Carrying Amount	3,940.9	3,930.4
Core technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,698.1	1,856.1
Impairment Charge		(185.7)
New Carrying Amount		1,670.4
Accumulated Amortization	(406.3)	(457.7)
Impairment Charge		74.3
Net Carrying Amount	1,291.8	1,287.0
Completed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	604.2	594.2
New Carrying Amount		594.2
Accumulated Amortization	(218.0)	(206.7)
Net Carrying Amount	386.2	387.5
Product trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	192.5	184.5
New Carrying Amount		184.5
Accumulated Amortization	(55.6)	(52.6)
Net Carrying Amount	136.9	131.9
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,387.1	2,666.1
Impairment Charge		(306.8)
New Carrying Amount		2,359.3
Accumulated Amortization	(708.0)	(859.3)
Impairment Charge		191.6
Net Carrying Amount	1,679.1	1,691.6
Non-compete contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4.6	4.6
New Carrying Amount		4.6
Accumulated Amortization	(3.3)	(3.1)
Net Carrying Amount	1.3	1.5
Sub-total [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,886.5	5,305.5
Impairment Charge		(492.5)
New Carrying Amount		4,813.0
Accumulated Amortization	(1,391.2)	(1,579.4)
Impairment Charge		265.9
Net Carrying Amount	3,495.3	3,499.5
Corporate trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	312.2	323.5
Impairment Charge		(11.3)
New Carrying Amount		312.2
Net Carrying Amount	312.2	312.2
Currency translation [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	166.8	147.2
New Carrying Amount		147.2
Accumulated Amortization	(33.4)	(28.5)
Net Carrying Amount	$ 133.4	$ 118.7