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INTANGIBLE ASSETS (Tables)
 12 Months Ended
Mar. 31, 2024
Intangible Assets [Abstract]  
Disclosure of reconciliation of changes in intangible assets and goodwill
CapitalizedTechnology,Other 
 (amounts in millions)
developmentCustomersoftwareintangible
GoodwillcostsrelationshipsLicensesand ERPassetsTotal
Net book value as at March 31, 2022$2,464.3 $234.4 $575.0 $262.8 $243.7 $16.1 $3,796.3 
Additions – internal development — 87.1 — — 39.3 — 126.4 
Business combinations (Note 3)
35.8 — (11.8)— 3.0 — 27.0 
Amortization — (31.1)(44.4)(16.1)(29.5)(1.8)(122.9)
Impairment reversal – net— 6.3 — — — — 6.3 
Transfers and others — (3.7)(1.3)— (0.9)0.4 (5.5)
Foreign currency exchange differences 163.2 1.7 36.8 6.7 14.0 0.8 223.2 
Net book value as at March 31, 2023$2,663.3 $294.7 $554.3 $253.4 $269.6 $15.5 $4,050.8 
Additions – internal development — 114.5 — — 24.6 — 139.1 
Additions – acquired separately— — — 8.8 — — 8.8 
Disposal of discontinued operations (Note 2)
(120.4)(39.1)(1.5)— (5.2)(1.8)(168.0)
Amortization — (37.7)(42.9)(15.8)(30.5)(2.5)(129.4)
Impairment(568.0)(38.8)(2.6)— (4.2)(2.7)(616.3)
Transfers and others — (6.5)— (0.3)(0.9)— (7.7)
Foreign currency exchange differences (3.6)0.1 (2.1)0.2 — — (5.4)
Net book value as at March 31, 2024$1,971.3 $287.2 $505.2 $246.3 $253.4 $8.5 $3,271.9 
 
    
 CapitalizedTechnology,Other 
developmentCustomersoftwareintangible
GoodwillcostsrelationshipsLicensesand ERP
assets

Total
Cost$2,699.7 $573.3 $829.6 $320.9 $513.2 $54.0 $4,990.7 
Accumulated amortization and impairment(36.4)(278.6)(275.3)(67.5)(243.6)(38.5)(939.9)
Net book value as at March 31, 2023$2,663.3 $294.7 $554.3 $253.4 $269.6 $15.5 $4,050.8 
Cost$2,539.3 $535.5 $781.8 $329.2 $499.8 $37.3 $4,722.9 
Accumulated amortization and impairment(568.0)(248.3)(276.6)(82.9)(246.4)(28.8)(1,451.0)
Net book value as at March 31, 2024$1,971.3 $287.2 $505.2 $246.3 $253.4 $8.5 $3,271.9 
Disclosure of reconciliation of changes in goodwill
The carrying amount of goodwill allocated to the Company's CGUs per operating segment is as follows:
DefenseDiscontinued
Civil Aviationand SecurityoperationsTotal
Net book value as at March 31, 2022$1,046.8 $1,305.8 $111.7 $2,464.3 
Business combinations (Note 3)
25.6 10.2 — 35.8 
Foreign currency exchange differences53.2 101.3 8.7 163.2 
Net book value as at March 31, 2023$1,125.6 $1,417.3 $120.4 $2,663.3 
Disposal of discontinued operations (Note 2)
— — (120.4)(120.4)
Impairment— (568.0)— (568.0)
Foreign currency exchange differences(4.8)1.2 — (3.6)
Net book value as at March 31, 2024$1,120.8 $850.5 $— $1,971.3