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LONG-TERM DEBT: Narrative (Details) | 6 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Term loans | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Long-term debt variable interest rate description | LIBOR |
Term loans | Alternative Base Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt variable interest rate description | Alternative base rate |
Revolving credit facility |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate on long-term debt (as a percent) | 5.75% |
Revolving credit facility | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Long-term debt variable interest rate description |  | LIBOR
Revolving credit facility | Alternative Base Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt variable interest rate description | Alternative base rate |

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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Weighted average interest rate of long-term debt outstanding calculated at point in time. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
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- Details
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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |