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EVENTS AFTER THE REPORTING PERIOD (Details)
ventilator in Thousands, $ in Millions, $ in Millions
 3 Months Ended
Apr. 10, 2020
ventilator
Apr. 09, 2020
CAD ($)
Jun. 29, 2020
employee
May 19, 2020
USD ($)
Apr. 20, 2020
employee
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Disclosure of non-adjusting events after reporting period [line items]              
Accounts receivable, maximum amount available to sell | $           $ 300.0 $ 300.0
Impact Of The COVID-19 Pandemic              
Disclosure of non-adjusting events after reporting period [line items]              
Number Of Employees With Reduced Work Weeks | employee     900        
Number Of Employees Temporarily Laid Off | employee     2,600        
Number Of Remaining Temporarily Laid-Off Employees Recalled | employee         1,500    
Cash and Liquidity Mitigation Measures              
Disclosure of non-adjusting events after reporting period [line items]              
Accounts receivable, maximum amount available to sell | $       $ 400.0      
Revolving Unsecured Credit Facilities | Cash and Liquidity Mitigation Measures              
Disclosure of non-adjusting events after reporting period [line items]              
Debt term   2 years          
Debt | $   $ 500.0          
Goodwill | Healthcare | Contract With Government Of Canada For CAE Air1 Ventilators              
Disclosure of non-adjusting events after reporting period [line items]              
Number of ventilators designed and manufactured | ventilator 10