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SUPPLEMENTARY CASH FLOWS INFORMATION (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Cash Flow Statement [Abstract] |  |
Accounts receivable | $ (1.3) | $ 18.1
Contract assets | (72.1) | (84.6)
Inventories | (22.2) | (6.3)
Prepayments | (5.7) | 19.7
Income taxes recoverable | (4.9) | (6.5)
Accounts payable and accrued liabilities | 157.0 | (44.2)
Provisions | (8.7) | (21.0)
Income taxes payable | 11.4 | 11.1
Deferred revenue | (2.5) | (1.7)
Contract liabilities | (15.8) | 71.8
Changes in non-cash working capital | $ 35.2 | $ (43.6)

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