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

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail)
AUD in Millions
12 Months Ended 48 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2017
AUD
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
AUD
Mar. 31, 2014
USD ($)
Tax Credit Carryforward [Line Items]              
Recognized tax deduction $ 55,300,000 AUD 73.4          
Contribution to AICF 91,100,000   $ 62,800,000 $ 113,000,000 $ 312,300,000 AUD 366.9  
Foreign tax credit carry-forwards 107,500,000   112,400,000   107,500,000    
Income taxes payable, current 1,900,000   4,800,000   1,900,000    
Income tax paid, net of refunds 51,500,000            
Undistributed certain domestic subsidiary earnings 201,900,000       201,900,000    
Total amount of unrecognized tax benefits 700,000   700,000 4,900,000 700,000   $ 500,000
Interest and penalties recognized income tax expense $ 0   $ 300,000 $ 300,000      
Period for the amount of unrecognized tax benefits increase or decrease Next twelve months Next twelve months          
Australia [Member]              
Tax Credit Carryforward [Line Items]              
Tax loss carry-forwards $ 17,800,000       17,800,000    
Foreign Tax Credit Carry-Forwards [Member]              
Tax Credit Carryforward [Line Items]              
Foreign tax credit carry-forwards $ 107,500,000       $ 107,500,000    
Percentage of valuation allowance against loss carry-forwards 100.00%       100.00%    
Europe [Member]              
Tax Credit Carryforward [Line Items]              
Tax loss carry-forwards $ 6,400,000       $ 6,400,000    
Tax loss carry-forwards available to offset future taxable income not subject to expiration 3,500,000       3,500,000    
Reversal of valuation allowance (4,200,000)            
Operating loss carry-forwards subject to expiration $ 2,900,000       $ 2,900,000