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LONG-TERM DEBT LONG-TERM DEBT (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Mar. 31, 2017
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Revolving long-term bank credit facility, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 2% |  |
Disclosure of detailed information about borrowings [line items] |  |
Maximum borrowing capacity | $ 1,000 | $ 1,000
Revolving long-term bank credit facility, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 1.25% |  |
Disclosure of detailed information about borrowings [line items] |  |
Maximum borrowing capacity | $ 300 | $ 300

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- Definition Line Of Credit Facility, Maximum Borrowing Capacity1 + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
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