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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION (Tables)
 12 Months Ended
Mar. 31, 2025
Disclosure of operating segments [abstract]  
Results by segment
Specified items included in the segment profitability measure are as follows: 
Defense  
Civil Aviationand SecurityTotal
202520242025202420252024
External revenue $2,709.3 $2,435.8 $1,998.6 $1,847.0 $4,707.9 $4,282.8 
Depreciation and amortization312.4 272.0 102.3 96.7 414.7 368.7 
Share of after-tax profit of equity accounted investees68.3 60.8 20.0 11.4 88.3 72.2 
Gross profit883.6 867.8 416.5 286.7 1,300.1 1,154.5 
Operating income (loss)605.3 442.0 123.9 (627.4)729.2 (185.4)
Adjusted segment operating income581.5 548.9 150.5 0.8 732.0 549.7 

Reconciliation of adjusted segment operating income is as follows:

Defense  
Civil Aviationand SecurityTotal
202520242025202420252024
Operating income (loss)$605.3 $442.0 $123.9 $(627.4)$729.2 $(185.4)
Restructuring, integration and acquisition costs (Note 6)
37.8 106.9 18.7 24.5 56.5 131.4 
Impairments and other gains and losses arising from
significant strategic transactions or specific events:
Gain on fair value remeasurement of SIMCOM (Note 7)
(72.6)— — — (72.6)— 
Shareholder matters6.3— 4.3 — 10.6 — 
Executive management transition costs4.7— 3.6 — 8.3 — 
Impairment of goodwill (Note 15)
—— — 568.0 — 568.0 
Impairment of technology and other non-financial assets (Note 5)—— — 35.7 — 35.7 
Adjusted segment operating income$581.5 $548.9 $150.5 $0.8 $732.0 $549.7 

Capital expenditures by segment, which consist of property, plant and equipment expenditures and intangible assets expenditures (excluding those acquired in business combinations), are as follows:

20252024
Civil Aviation $296.3 $335.3 
Defense and Security147.8 128.7 
Discontinued operations (Note 3)
— 13.7 
Total capital expenditures$444.1 $477.7 
Assets and liabilities employed by segment are reconciled to total assets and liabilities as follows:

20252024
Assets employed
  
Civil Aviation $7,263.4 $6,131.8 
Defense and Security 3,000.6 2,869.3 
Assets not included in assets employed by segment949.8 833.0 
Total assets $11,213.8 $9,834.1 
Liabilities employed
  
Civil Aviation$1,369.1 $1,260.1 
Defense and Security 1,009.3 828.1 
Liabilities not included in liabilities employed by segment3,859.4 3,443.3 
Total liabilities $6,237.8 $5,531.5 
Products and services information
The Company's revenue from external customers for its products and services are as follows:
Defense
Civil Aviationand SecurityTotal
202520242025202420252024
Products$963.7 $786.6 $907.7 $708.7 $1,871.4 $1,495.3 
Training, software and services1,745.6 1,649.2 1,090.9 1,138.3 2,836.5 2,787.5 
Total external revenue$2,709.3 $2,435.8 $1,998.6 $1,847.0 $4,707.9 $4,282.8 
Geographic information
The Company markets its products and services globally. Revenues are attributed to geographical regions based on the location of customers. Non-current assets other than financial instruments and deferred tax assets are attributed to geographical regions based on the location of the assets, excluding goodwill. Goodwill is presented by geographical regions based on the Company’s allocation of the related purchase price.
20252024
External revenue  
Canada$474.2 $460.7 
United States2,241.8 2,076.3 
United Kingdom281.6 271.1 
Rest of Americas133.0 98.8 
Europe663.6 645.1 
Asia759.9 566.1 
Oceania and Africa153.8 164.7 
$4,707.9 $4,282.8 
20252024
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets  
Canada$1,541.7 $1,527.7 
United States4,534.7 3,623.5 
United Kingdom399.0 360.5 
Rest of Americas221.8 201.9 
Europe1,162.3 985.5 
Asia610.8 532.0 
Oceania and Africa188.2 108.9 
$8,658.5 $7,340.0