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

Asbestos - Additional Information (Detail)

v2.4.0.6
Asbestos - Additional Information (Detail)
 1 Months Ended 6 Months Ended 12 Months Ended
Apr. 03, 2012
USD ($)
Apr. 03, 2012
AUD
Feb. 17, 2012
USD ($)
Feb. 17, 2012
AUD
Jun. 30, 2012
USD ($)
M
Jun. 30, 2012
AUD
M
Mar. 31, 2013
USD ($)
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
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             6,000,000              
Amounts offset against income tax payable             25,600,000 24,800,000 23,100,000          
Unfavorable effect of foreign currency exchange in income taxes payable             700,000              
Provision for asbestos-related education and medical research contribution             1,900,000   2,300,000          
Net asset of AICF             300,000              
AICF invested excess cash in time deposits         106,500,000 105,000,000 106,500,000 105,000,000            
Fixed interest rate         5.10% 5.10%                
Maturity period         6 6                
AICF's short-term investments available-for-sale resulting for mark-to-market fair value adjustment             900,000 900,000            
Discounted (but inflated) central estimate of asbestos liability             1,800,000,000 1,700,000,000            
Undiscounted (but inflated) central estimate of asbestos liability             2,600,000,000 2,500,000,000            
Expected insurance recoveries included in undiscounted central estimate of asbestos liability             357,300,000 342,900,000            
Credit risk allowance for insurance             28,600,000 27,400,000            
Subrogation recoveries from other third parties             54,900,000 52,700,000            
Discounted (but inflated) central estimate lower range value             1,100,000,000 1,100,000,000            
Discounted (but inflated) central estimate high range value             2,700,000,000 2,600,000,000            
Undiscounted (but inflated) central estimate lower range value             1,700,000,000 1,600,000,000            
Undiscounted (but inflated) central estimate high range value             4,400,000,000 4,200,000,000            
Change in estimated peak year             5 years 5 years            
Potential increase in discounted central estimate             45.00% 45.00%            
Secured standby loan facility maximum borrowing capacity             333,400,000 320,000,000            
Discounted value of insurance policies             225,400,000 216,300,000            
Amount available for insurance policies benefit adjustment               320,000,000            
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            
Initial drawing under facility     32,000,000 29,700,000                    
Amount repaid under the facility $ 32,000,000 29,700,000         $ 30,000,000 29,700,000