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

Long-Term Debt - Summary of Company's Credit Facilities (Detail)

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Long-Term Debt - Summary of Company's Credit Facilities (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Line of Credit Facility [Line Items]  
Total Facility $ 405.0
Principal Drawn   
Term facilities maturity February 2014 [Member]
 
Line of Credit Facility [Line Items]  
Effective Interest Rate   
Total Facility 50.0
Principal Drawn   
Term facilities maturity March 2016 [Member]
 
Line of Credit Facility [Line Items]  
Effective Interest Rate   
Total Facility 50.0
Principal Drawn   
Term facilities maturity April 2016 [Member]
 
Line of Credit Facility [Line Items]  
Effective Interest Rate   
Total Facility 190.0
Principal Drawn   
Term facilities maturity March 2017 [Member]
 
Line of Credit Facility [Line Items]  
Effective Interest Rate   
Total Facility 40.0
Principal Drawn   
Term facilities maturity April 2017 [Member]
 
Line of Credit Facility [Line Items]  
Effective Interest Rate   
Total Facility 75.0
Principal Drawn