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Long-term Debt and Capital Lease Obligations (Detail) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 3 Months Ended
Apr. 30, 2012
Jul. 31, 2012
Apr. 30, 2011
Debt Instrument [Line Items]      
Total long-term debt and capital lease obligations $ 1,287,080 $ 1,357,185 $ 1,291,486
Less: current portion (17,701) (15,104) (106,642)
Long-term 1,269,379 1,342,081 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 1,084,109 1,084,423 1,082,936
US LIBOR plus margin | Revolving Credit Facility
     
Debt Instrument [Line Items]      
Principal Repayment terms At maturity [1] At maturity  
Facility maturity dates October 2015 [1] October 2015  
Total long-term debt and capital lease obligations 125,000 [1] 195,000 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 0 9,000  
Eurocopter Loan - 2.50% | Other Term Loans
     
Debt Instrument [Line Items]      
Principal Repayment terms On demand On demand  
Facility maturity dates - -  
Total long-term debt and capital lease obligations 4,623 2,054  
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 [1] Semi-annually  
Facility maturity dates June 2014 [1] June 2014  
Total long-term debt and capital lease obligations 2,745 [1] 2,167 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 [1] Semi-annually  
Facility maturity dates April 2018 [1] April 2018  
Total long-term debt and capital lease obligations 10,476 [1] 5,170 13,609 [1]
Capital Lease Obligations
     
Debt Instrument [Line Items]      
Principal Repayment terms Quarterly Quarterly  
Facility maturity dates June 2012 - May 2014 September 2012 - May 2014  
Total long-term debt and capital lease obligations 26,922 26,778 117,371
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 33,205 32,593  
Eurocopter Loan - 2.50% maturity in June 2011 | 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 - 5.04% maturity in November 2011 | 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%)