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

Asbestos - Additional Information (Detail)

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Asbestos - Additional Information (Detail)
 12 Months Ended 12 Months Ended
Mar. 31, 2014
USD ($)
Mar. 31, 2014
AUD
Mar. 31, 2013
USD ($)
Mar. 31, 2013
AUD
Mar. 31, 2012
USD ($)
Jul. 02, 2012
USD ($)
Jul. 02, 2012
AUD
Apr. 02, 2012
USD ($)
Apr. 02, 2012
AUD
Mar. 31, 2012
AUD
Mar. 31, 2014
Maximum [Member]
Mar. 31, 2014
Other Net Assets (Liabilities) [Member]
USD ($)
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items]                        
Contribution to AICF     $ 184,100,000 177,500,000   $ 45,400,000 45,200,000 $ 138,700,000 132,300,000 132,300,000    
Restricted cash and cash equivalents related to early contribution to AICF         138,700,000              
Adjusted net cash used by operating activities - AFFA     29,400,000 28,200,000                
Insurance receivable 2,600,000                      
Amounts offset against income tax payable 16,800,000 18,000,000 25,600,000                  
Unfavorable effect of foreign currency exchange in income taxes payable 3,900,000                      
Provision for asbestos-related education and medical research contribution 1,700,000   1,900,000                  
Net asset of AICF 900,000   300,000                  
Effect of foreign currency exchange on other assets and liabilities 97,200,000   200,000   (6,200,000)             200,000
Discounted (but inflated) central estimate lower range value 1,200,000,000 1,300,000,000                    
Discounted (but inflated) central estimate high range value 2,700,000,000 3,000,000,000                    
Undiscounted (but inflated) central estimate lower range value 1,700,000,000 1,800,000,000                    
Undiscounted (but inflated) central estimate high range value 4,600,000,000 5,000,000,000                    
Potential increase in discounted central estimate 17.00% 17.00%                 22.00%  
Secured standby loan facility maximum borrowing capacity 295,100,000 320,000,000                    
Discounted value of insurance policies 197,600,000 214,300,000                    
Amount available for insurance policies benefit adjustment   320,000,000                    
Amount outstanding under facility $ 47,000,000 50,600,000                    
Secured standby loan Facility maturity date Nov. 01, 2030 Nov. 01, 2030                    
Percentage of borrowings from Commonwealth 50.00% 50.00%                    
Rate of interest of Benchmark Bonds 6.00% 6.00%                    
Maturity date of Benchmark Bonds May 01, 2020 May 01, 2020