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2416408 - Disclosure - Income Taxes - Summary Activity of Total Amounts of Unrecognized Tax Benefits (Detail)
(http://www.chc.ca/role/IncomeTaxesSummaryActivityOfTotalAmountsOfUnrecognizedTaxBenefitsDetail)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001586300 (http://www.sec.gov/CIK)
Income Tax Disclosure [Abstract]Period [Axis]
2015-05-01 - 2016-04-30
2014-05-01 - 2015-04-30
2013-05-01 - 2014-04-30
Income Tax Disclosure [Abstract]
 
 
 
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
 
 
 
Opening balance
29,435,000  
25,475,000  
24,281,000  
Additions in the current year
3,077,000  
6,714,000  
5,187,000  
Reductions in current year
(734,000) 
0  
(3,117,000) 
Foreign exchange
(2,196,000) 
(2,754,000) 
(876,000) 
Total
29,582,000  
 
29,435,000  
 
25,475,000