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FINANCIAL RISK MANAGEMENT (Details)
shares in Thousands, £ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2018
CAD ($)
Debt_tranche
shares
Mar. 31, 2017
CAD ($)
shares
Mar. 31, 2018
USD ($)
Financial_institution
Interest_rate_swap_agreements
Foreign_currency_swap_agreement
Equity_swap_agreement
Mar. 31, 2018
CAD ($)
Financial_institution
Interest_rate_swap_agreements
Foreign_currency_swap_agreement
Equity_swap_agreement
Mar. 31, 2018
GBP (£)
Financial_institution
Interest_rate_swap_agreements
Foreign_currency_swap_agreement
Equity_swap_agreement
Mar. 31, 2017
USD ($)
Financial_institution
Interest_rate_swap_agreements
Foreign_currency_swap_agreement
Equity_swap_agreement
Mar. 31, 2017
CAD ($)
Financial_institution
Interest_rate_swap_agreements
Foreign_currency_swap_agreement
Equity_swap_agreement
Mar. 31, 2017
GBP (£)
Financial_institution
Interest_rate_swap_agreements
Foreign_currency_swap_agreement
Equity_swap_agreement
Mar. 31, 2013
Foreign_currency_swap_agreement
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]                  
Accounts receivable, maximum amount available to sell     $ 300.0     $ 150.0      
Accounts receivable, amount sold to financial institution       $ 168,300,000     $ 141,600,000    
Accounts receivable, amount sold to financial institution, fees $ 2,400,000 $ 1,200,000              
Net income 355,700,000 256,600,000              
Other comprehensive income (loss) $ 43,300,000 $ (13,900,000)              
Equity swap agreement, common shares (in shares) | shares 2,150 1,850              
Borrowings       1,260,900,000     1,255,400,000    
Letters of credit and guarantees, net       223,400,000     238,200,000    
Sale and leaseback transactions, maximum exposure       11,200,000     11,600,000    
Deferred gains on sale and leasebacks       9,200,000     10,000,000    
Revolving Unsecured Term Credit Facility, September 2022                  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]                  
Line of credit facility, maximum borrowing capacity     550.0 550,000,000   $ 550.0      
Line of credit facility, maximum borrowing capacity option     $ 850.0 850,000,000          
Borrowings       0     $ 0    
Fiscal Year 2020                  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]                  
Sale and leaseback transactions, maximum exposure       7,200,000          
Fiscal Year 2023                  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]                  
Sale and leaseback transactions, maximum exposure       $ 4,000,000          
Foreign currency swap agreements                  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]                  
Number of derivative agreements entered into | Interest_rate_swap_agreements     2 2 2 2 2 2  
Derivative, notional amount       $ 2,200,000     $ 10,700,000    
Interest rate swap agreements, number of financial institutions | Financial_institution     1 1 1 1 1 1  
Debt, fixed interest rate     88.00% 88.00% 88.00% 90.00% 90.00% 90.00%  
Equity swap agreements                  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]                  
Number of derivative agreements entered into | Equity_swap_agreement     4 4 4 2 2 2  
Currency risk                  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]                  
Foreign currency strengthening change     5.00% 5.00% 5.00%        
Interest rate risk                  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]                  
Sensitivity analysis to interest rate change 1.00%                
Net income $ 1,200,000 $ 1,300,000              
Other comprehensive income (loss) $ 300,000 500,000              
USD/GBP | Foreign currency swap agreements                  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]                  
Number of derivative agreements entered into | Foreign_currency_swap_agreement     1 1 1 1 1 1  
Derivative, notional amount     $ 1.1   £ 0.6 $ 5.7   £ 2.8  
USD/CDN | Foreign currency swap agreements                  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]                  
Number of derivative agreements entered into | Foreign_currency_swap_agreement                 2
Number of tranches relating to the multi-tranche private placement debt offering | Debt_tranche 2                
USD/CDN | Currency risk                  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]                  
Net income $ 4,600,000 (3,300,000)              
Other comprehensive income (loss) $ (17,300,000) $ (10,600,000)              
Multi-Tranche Private Placement Debt, Tranche One, December 2024 | USD/CDN | Foreign currency swap agreements                  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]                  
Derivative, notional amount     127.0 $ 130,500,000   127.0 $ 130,500,000    
Multi-Tranche Private Placement Debt, Tranche Two, December 2027 | USD/CDN | Foreign currency swap agreements                  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]                  
Derivative, notional amount     98.0 $ 100,700,000   98.0 $ 100,700,000    
Hedges Of Net Investment In US Entities                  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]                  
Gross finance lease obligations     8.6     9.9      
Hedges Of Net Investment In US Entities | Senior Notes                  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]                  
Borrowings     $ 372.8     $ 372.8