Goodwill and Other Intangible Assets - Schedule of Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2013
Feb. 28, 2014
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 5,358.7 $ 5,256.7
Impairment Charge (145.1)  
New Carrying Amount 5,213.6  
Accumulated Amortization (1,634.1) (1,797.9)
Impairment Charge 50.7  
Net Carrying Amount 3,630.2 3,458.8
Core technology [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,772.6 1,733.3
Impairment Charge (39.0)  
New Carrying Amount 1,733.6  
Accumulated Amortization (481.1) (548.0)
Impairment Charge 4.1  
Net Carrying Amount 1,256.6 1,185.3
Completed technology [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 628.8 610.1
Impairment Charge (48.5)  
New Carrying Amount 580.3  
Accumulated Amortization (254.9) (252.0)
Impairment Charge 36.7  
Net Carrying Amount 362.1 358.1
Product trade names [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 204.2 214.4
Impairment Charge 0  
New Carrying Amount 204.2  
Accumulated Amortization (65.9) (75.2)
Impairment Charge 0  
Net Carrying Amount 138.3 139.2
Customer relationships [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 2,429.5 2,386.1
Impairment Charge (46.1)  
New Carrying Amount 2,383.4  
Accumulated Amortization (828.4) (918.1)
Impairment Charge 9.9  
Net Carrying Amount 1,564.9 1,468.0
Non-compete contracts [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 4.6 4.6
Impairment Charge 0  
New Carrying Amount 4.6  
Accumulated Amortization (3.8) (4.6)
Impairment Charge 0  
Net Carrying Amount 0.8 0
Sub-total [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 5,039.7 4,948.5
Impairment Charge (133.6)  
New Carrying Amount 4,906.1  
Accumulated Amortization (1,634.1) (1,797.9)
Impairment Charge 50.7  
Net Carrying Amount 3,322.7 3,150.6
Corporate trade names [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 319.0 308.2
Impairment Charge (11.5)  
New Carrying Amount 307.5  
Accumulated Amortization 0 0
Impairment Charge 0  
Net Carrying Amount $ 307.5 $ 308.2