Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v2.4.0.8
Income Taxes - Additional Information (Detail)
In Millions, unless otherwise specified
12 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2014
USD ($)
Mar. 31, 2013
USD ($)
Mar. 31, 2012
USD ($)
Mar. 31, 2011
USD ($)
Mar. 31, 2014
Europe [Member]
USD ($)
Mar. 31, 2013
Australia [Member]
USD ($)
Mar. 31, 2014
Foreign Tax Credit Carry-Forwards [Member]
USD ($)
Mar. 31, 2014
Non-Irish Subsidiaries [Member]
USD ($)
Nov. 30, 2013
RCI [Member]
USD ($)
Nov. 30, 2013
RCI [Member]
AUD
Mar. 31, 2012
RCI [Member]
USD ($)
Tax Credit Carryforward [Line Items]                      
Tax loss carry-forwards         $ 7.0            
Tax loss carry-forwards available to offset future taxable income not subject to expiration         5.6            
Percentage of valuation allowance against loss carry-forwards         100.00%   100.00%        
Operating loss carry-forwards subject to expiration         1.4            
Deferred tax assets 412.0 402.8       34.5          
Percentage of valuation allowance against deferred tax assets           100.00%          
Foreign tax credit carry-forwards 135.4 123.9         135.4        
Undistributed foreign earnings               675.3      
Income tax expense (benefit) due to tax audit settlements and statute of limitations expiration (0.3) 0.2 0.5                
Total amount of unrecognised tax benefits 0.5 1.5 2.6 185.5              
Total amount of interest and penalties accrued    0.1 0.9 196.3              
Interest and penalties recognised income tax expense 0.1 0.8                  
Period for the amount of unrecognised tax benefits increase or decrease Next 12 months                    
Aggregate refund amended assessment                     396.3
Income tax benefit from RCI's successful appeal                 $ 15.4 17.3