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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Mar. 31, 2021
General Information About Financial Statements [Abstract]  
Disclosure of estimated useful lives of property, plant and equipment The estimated useful lives, residual values and depreciation methods are as follows:
 
 MethodAmortization rate/period
Buildings and improvements
Declining balance/Straight-line
2.5% to 10%/3 to 40 years
Simulators
Straight-line (10% residual)
Not exceeding 25 years
Machinery and equipment
Declining balance/Straight-line
20% to 35%/2 to 15 years
Aircraft
Straight-line (residual not exceeding 15%)
Not exceeding 25 years
Aircraft engines
Based on utilization
Not exceeding 3500 hours
        
   MachineryAssets 
  
Buildings andunder 
 (amounts in millions)
and landSimulatorsequipmentAircraftconstructionTotal
Net book value as at April 1, 2019$241.7 $1,450.3 $51.5 $54.8 $145.0 $1,943.3 
Additions31.0 27.3 13.9 11.3 207.1 290.6 
Additions – business combinations (Note 4)0.1 — 0.1 0.6 — 0.8 
Disposals(0.1)(0.5)— (0.1)— (0.7)
Depreciation(17.7)(105.0)(17.9)(5.0)— (145.6)
Impairment— (1.8)— — — (1.8)
Transfers and others2.2 155.0 2.8 4.6 (151.6)13.0 
Foreign currency exchange differences5.6 44.0 1.0 3.1 0.7 54.4 
Net book value as at March 31, 2020$262.8 $1,569.3 $51.4 $69.3 $201.2 $2,154.0 
Additions16.2 13.4 13.4 19.1 45.5 107.6 
Additions – business combinations (Note 4)0.3 7.9 0.3 — — 8.5 
Disposals— (1.9)(0.1)(0.4)(1.6)(4.0)
Depreciation(19.8)(113.3)(15.9)(5.8)— (154.8)
Impairment — (76.7)— — — (76.7)
Transfers and others36.1 145.3 1.4 0.6 (97.3)86.1 
Foreign currency exchange differences(13.5)(120.9)(2.2)(6.7)(8.0)(151.3)
Net book value as at March 31, 2021$282.1 $1,423.1 $48.3 $76.1 $139.8 $1,969.4 
 
       
  MachineryAssets 
 Buildings andunder 
 (amounts in millions)
and landSimulatorsequipmentAircraftconstructionTotal
Cost$490.0 $2,191.1 $203.1 $82.2 $201.2 $3,167.6 
Accumulated depreciation and impairment(227.2)(621.8)(151.7)(12.9)— (1,013.6)
Net book value as at March 31, 2020$262.8 $1,569.3 $51.4 $69.3 $201.2 $2,154.0 
Cost$513.8 $2,140.6 $192.9 $91.9 $139.8 $3,079.0 
Accumulated depreciation and impairment(231.7)(717.5)(144.6)(15.8)— (1,109.6)
Net book value as at March 31, 2021$282.1 $1,423.1 $48.3 $76.1 $139.8 $1,969.4 
Disclosure of additional information of leasing activities for lessee The depreciation periods, residual values (only applicable when it is reasonably certain that the Company will obtain ownership by the end of the lease term) and depreciation methods are as follows:
 MethodAmortization period
Buildings and landStraight-line
 Not exceeding 40 years
SimulatorsStraight-line (10% residual)
Not exceeding 25 years
Machinery and equipmentStraight-line
Not exceeding 7 years
Disclosure of estimated useful lives of intangible assets
Amortization is calculated using the straight-line method for all intangible assets over their estimated useful lives as follows:
 Amortization period
Capitalized development costs
3 to 10 years
Customer relationships
3 to 20 years
Licenses
3 to 20 years
ERP and other software
3 to 10 years
Other intangible assets
2 to 40 years