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Schedule of Deferred Stock Unit Compensation Expense (Detail) - USD ($) $ in Thousands | 4 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2017 | Mar. 31, 2017
Deferred Stock Unit | Predecessor |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Compensation expense (benefit) | $ (68) | $ (1,987)

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- Definition Share based compensation expense (benefit). + References No definition available. + Details
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Balance Type: | debit
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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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |