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SUPPLEMENTARY CASH FLOWS INFORMATION (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Cash Flow Statement [Abstract] |  |
Accounts receivable | $ 0.3 | $ (35.9)
Contracts in progress: assets | (58.5) | (3.7)
Inventories | 2.2 | (55.5)
Prepayments | 19.7 | 1.2
Income taxes recoverable | (6.5) | 4.4
Accounts payable and accrued liabilities | (58.2) | 16.2
Provisions | (21.0) | (2.1)
Income taxes payable | 11.1 | (1.0)
Deferred revenue | 99.0 | 79.2
Contracts in progress: liabilities | (31.2) | 26.3
Changes in non-cash working capital | $ (43.1) | $ 29.1

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