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

Asbestos (Details Textual)

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Asbestos (Details Textual)
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2012
Feb. 29, 2012
USD ($)
Feb. 29, 2012
AUD
May 21, 2012
USD ($)
Mar. 31, 2012
USD ($)
Mar. 31, 2012
AUD
Mar. 31, 2011
USD ($)
Apr. 02, 2012
USD ($)
Jul. 01, 2011
USD ($)
Asbestos (Textual) [Abstract]                  
Contribution to AICF               $ 138,700,000 $ 51,500,000
Amounts Offset Against Income Tax Payable         (23,100,000) (22,100,000) (21,100,000)    
Percentage of cash received 35.00%                
Insurance receivable         8,400,000        
Favorable effect of foreign currency exchange in income taxes payable         600,000        
Provision for Asbestos Related Education and Medical Research Contribution         2,300,000   2,500,000    
Other Net Assets Related to AICF              1,300,000    
AICF's short-term investments available-for-sale resulting for mark-to-market fair value adjustment         100,000 100,000      
Discounted (but inflated) central estimate of asbestos liability         1,700,000,000 1,600,000,000      
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         401,500,000 386,000,000      
Credit risk allowance for insurance         46,600,000 44,800,000      
Subrogation recoveries from other third parties         56,100,000 53,900,000      
Discounted (but inflated) central estimate lower range value         1,100,000,000 1,100,000,000      
Discounted (but inflated) central estimate high range value         2,500,000,000 2,400,000,000      
Undiscounted (but inflated) central estimate lower range value         1,700,000,000 1,600,000,000      
Undiscounted (but inflated) central estimate high range value         4,500,000,000 4,300,000,000      
Change in estimated peak year         5 years 5 years      
Potential increase in Discounted Central Estimate         50.00% 50.00%      
Secured standby loan facility maximum borrowing capacity         332,900,000 320,000,000      
Discounted value of insurance policies         218,300,000 209,900,000      
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   32,000,000 29,700,000      
Additional drawing under facility       0          
Amount outstanding under the facility         $ 32,000,000 29,700,000