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INCOME TAXES - Movements In Temporary Differences (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | $ (195.8) | $ (166.3)
Deferred tax expense (income) recognised in profit or loss | 35.7 | (26.4)
Income tax relating to components of other comprehensive income | 11.7 | (7.7)
Increase (decrease) through discontinued operation and transferred from assets held for sale | 0.0 | 0.4
Increase (decrease) through business combinations, deferred tax liability (asset) | (3.9) | 6.7
Increase (decrease) through net exchange differences, deferred tax liability (asset) | 5.1 | (2.5)
Deferred tax liability (asset), end | (147.2) | (195.8)
Non-capital loss carryforwards |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | 50.5 | 49.4
Deferred tax expense (income) recognised in profit or loss | (5.4) | 0.6
Income tax relating to components of other comprehensive income | 0.0 | 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale | 0.0 | 0.4
Increase (decrease) through business combinations, deferred tax liability (asset) | 0.0 | 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) | 0.6 | 0.1
Deferred tax liability (asset), end | 45.7 | 50.5
Intangible assets |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | (84.1) | (74.1)
Deferred tax expense (income) recognised in profit or loss | 12.5 | (3.0)
Income tax relating to components of other comprehensive income | 0.0 | 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale | 0.0 | 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) | (14.5) | (7.1)
Increase (decrease) through net exchange differences, deferred tax liability (asset) | (1.7) | 0.1
Deferred tax liability (asset), end | (87.8) | (84.1)
Amounts not currently deductible |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | 48.5 | 34.3
Deferred tax expense (income) recognised in profit or loss | (6.4) | 14.0
Income tax relating to components of other comprehensive income | 0.0 | 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale | 0.0 | 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) | 5.9 | 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) | (0.4) | 0.2
Deferred tax liability (asset), end | 47.6 | 48.5
Deferred revenue |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | 25.8 | 25.4
Deferred tax expense (income) recognised in profit or loss | (6.1) | (10.2)
Income tax relating to components of other comprehensive income | 0.0 | 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale | 0.0 | 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) | 0.3 | 10.5
Increase (decrease) through net exchange differences, deferred tax liability (asset) | 0.3 | 0.1
Deferred tax liability (asset), end | 20.3 | 25.8
Tax benefit carryover |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | 6.0 | 5.7
Deferred tax expense (income) recognised in profit or loss | (2.8) | 0.2
Income tax relating to components of other comprehensive income | 0.0 | 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale | 0.0 | 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) | 0.0 | 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) | (0.1) | 0.1
Deferred tax liability (asset), end | 3.1 | 6.0
Unclaimed research and development expenditures |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | 20.2 | 24.1
Deferred tax expense (income) recognised in profit or loss | 17.2 | (3.9)
Income tax relating to components of other comprehensive income | 0.0 | 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale | 0.0 | 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) | 0.0 | 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) | 0.0 | 0.0
Deferred tax liability (asset), end | 37.4 | 20.2
Investment tax credits |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | (60.0) | (56.7)
Deferred tax expense (income) recognised in profit or loss | (4.6) | (3.3)
Income tax relating to components of other comprehensive income | 0.0 | 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale | 0.0 | 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) | 0.0 | 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) | 0.0 | 0.0
Deferred tax liability (asset), end | (64.6) | (60.0)
Property, plant and equipment |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | (148.9) | (131.6)
Deferred tax expense (income) recognised in profit or loss | 33.1 | (17.5)
Income tax relating to components of other comprehensive income | 0.0 | 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale | 0.0 | 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) | 4.5 | 3.3
Increase (decrease) through net exchange differences, deferred tax liability (asset) | 6.7 | (3.1)
Deferred tax liability (asset), end | (104.6) | (148.9)
Unrealized (gains) losses on foreign exchange |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | (16.0) | (16.1)
Deferred tax expense (income) recognised in profit or loss | 1.0 | (1.3)
Income tax relating to components of other comprehensive income | 1.3 | 1.5
Increase (decrease) through discontinued operation and transferred from assets held for sale | 0.0 | 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) | (0.1) | 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) | (0.1) | (0.1)
Deferred tax liability (asset), end | (13.9) | (16.0)
Financial instruments |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | (3.0) | (1.0)
Deferred tax expense (income) recognised in profit or loss | 1.3 | 2.1
Income tax relating to components of other comprehensive income | 1.5 | (4.1)
Increase (decrease) through discontinued operation and transferred from assets held for sale | 0.0 | 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) | 0.0 | 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) | (0.1) | 0.0
Deferred tax liability (asset), end | (0.3) | (3.0)
Government participation |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | (27.4) | (24.9)
Deferred tax expense (income) recognised in profit or loss | 0.1 | (2.5)
Income tax relating to components of other comprehensive income | 0.0 | 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale | 0.0 | 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) | 0.0 | 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) | 0.0 | 0.0
Deferred tax liability (asset), end | (27.3) | (27.4)
Employee benefit plans |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | 39.6 | 41.7
Deferred tax expense (income) recognised in profit or loss | 3.1 | 3.1
Income tax relating to components of other comprehensive income | 8.9 | (5.1)
Increase (decrease) through discontinued operation and transferred from assets held for sale | 0.0 | 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) | 0.0 | 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) | 0.0 | (0.1)
Deferred tax liability (asset), end | 51.6 | 39.6
Percentage-of-completion versus completed contract |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | (45.4) | (40.6)
Deferred tax expense (income) recognised in profit or loss | (7.1) | (5.0)
Income tax relating to components of other comprehensive income | 0.0 | 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale | 0.0 | 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) | 0.0 | 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) | (0.1) | 0.2
Deferred tax liability (asset), end | (52.6) | (45.4)
Other |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liability (asset), start | (1.6) | (1.9)
Deferred tax expense (income) recognised in profit or loss | (0.2) | 0.3
Income tax relating to components of other comprehensive income | 0.0 | 0.0
Increase (decrease) through discontinued operation and transferred from assets held for sale | 0.0 | 0.0
Increase (decrease) through business combinations, deferred tax liability (asset) | 0.0 | 0.0
Increase (decrease) through net exchange differences, deferred tax liability (asset) | 0.0 | 0.0
Deferred tax liability (asset), end | $ (1.8) | $ (1.6)

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