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Long-term Debt and Capital Lease Obligations (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Jan. 31, 2013
Apr. 30, 2012
Apr. 30, 2011
Debt Instrument [Line Items]      
Total long-term debt and capital lease obligations $ 1,503,326 $ 1,287,080 $ 1,291,486
Less: current portion (24,104) (17,701) (106,642)
Long-term debt and capital lease obligations 1,479,222 1,269,379 1,184,844
Senior Secured Notes
     
Debt Instrument [Line Items]      
Principal Repayment terms At maturity At maturity  
Facility maturity dates October 2020 October 2020  
Total long-term debt and capital lease obligations 1,287,005 1,084,109 1,082,936
US LIBOR Plus Margin | Revolving Credit Facility
     
Debt Instrument [Line Items]      
Principal Repayment terms At maturity At maturity [1]  
Facility maturity dates October 2015 October 2015 [1]  
Total long-term debt and capital lease obligations 110,000 125,000 [1] 70,000 [1]
Alternate Base Rate Plus Margin | Revolving Credit Facility
     
Debt Instrument [Line Items]      
Principal Repayment terms At maturity    
Facility maturity dates October 2015    
Total long-term debt and capital lease obligations 22,144    
Eurocopter Loan - 2.50% | Other Term Loans
     
Debt Instrument [Line Items]      
Principal Repayment terms At maturity On demand  
Facility maturity dates December 2015 -  
Total long-term debt and capital lease obligations 2,295 4,623  
EDC-B.A. CDOR rate (6 month) plus a 0.8% margin maturity in June 2014 | Other Term Loans
     
Debt Instrument [Line Items]      
Principal Repayment terms Semi-annually Semi-annually [1]  
Facility maturity dates June 2014 June 2014 [1]  
Total long-term debt and capital lease obligations 1,629 2,745 [1] 3,993 [1]
EDC-B.A. CDOR rate (6 month) plus a 0.8% margin maturity in April 2018 | Other Term Loans
     
Debt Instrument [Line Items]      
Principal Repayment terms Semi-annually Semi-annually [1]  
Facility maturity dates April 2018 April 2018 [1]  
Total long-term debt and capital lease obligations   10,476 [1] 13,609 [1]
Capital Lease Obligations
     
Debt Instrument [Line Items]      
Principal Repayment terms Quarterly Quarterly  
Facility maturity dates March 2013 - October 2017 June 2012 - May 2014  
Total long-term debt and capital lease obligations 47,894 26,922 117,371
Boundary Bay Financing - 6.93%
     
Debt Instrument [Line Items]      
Principal Repayment terms Monthly Monthly  
Facility maturity dates April 2035 April 2035  
Total long-term debt and capital lease obligations 32,359 33,205  
Eurocopter Loan Two Point Five Zero Percentage Maturity in June Twenty Eleven [Member] | Other Term Loans
     
Debt Instrument [Line Items]      
Principal Repayment terms   At maturity  
Facility maturity dates   June 2011  
Total long-term debt and capital lease obligations     1,618
Edc Us Loan Five Point Zero Four Percentage Maturity in November Twenty Eleven [Member] | Other Term Loans
     
Debt Instrument [Line Items]      
Principal Repayment terms   Semi-annually  
Facility maturity dates   November 2011  
Total long-term debt and capital lease obligations     $ 1,959
[1] Margins range from 0.8% to 4.5% during the year ended April 30, 2012 (2011 - 0.8% to 3.75%)