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Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Mar. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fair value of plan assets | $ 8,846 |
Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fair value of plan assets |  | $ 8,759
Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 8,806 |
Other pending transactions | 39 |
Total fair value of plan assets | 8,845 |
Supplemental Executive Retirement Plan | Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets |  | 8,760
Total fair value of plan assets |  | 8,760
Supplemental Executive Retirement Plan | Measured At Net Asset Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 1,754 |
Total fair value of plan assets | 1,754 |
Supplemental Executive Retirement Plan | Measured At Net Asset Value | Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets |  | 1,720
Total fair value of plan assets |  | 1,720
Supplemental Executive Retirement Plan | Quoted Prices In Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 6,047 |
Other pending transactions | 39 |
Total fair value of plan assets | 6,086 |
Supplemental Executive Retirement Plan | Quoted Prices In Active Markets (Level 1) | Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets |  | 6,023
Total fair value of plan assets |  | 6,023
Supplemental Executive Retirement Plan | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 1,005 |
Total fair value of plan assets | 1,005 |
Supplemental Executive Retirement Plan | Level 2 | Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets |  | 1,017
Total fair value of plan assets |  | 1,017
Supplemental Executive Retirement Plan | Equity Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 5,181 |
Supplemental Executive Retirement Plan | Equity Securities | Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets |  | 5,176
Supplemental Executive Retirement Plan | Equity Securities | Quoted Prices In Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 5,181 |
Supplemental Executive Retirement Plan | Equity Securities | Quoted Prices In Active Markets (Level 1) | Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets |  | 5,176
Supplemental Executive Retirement Plan | Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 3,404 |
Supplemental Executive Retirement Plan | Debt Securities | Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets |  | 3,261
Supplemental Executive Retirement Plan | Debt Securities | Measured At Net Asset Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 1,700 |
Supplemental Executive Retirement Plan | Debt Securities | Measured At Net Asset Value | Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets |  | 1,648
Supplemental Executive Retirement Plan | Debt Securities | Quoted Prices In Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 851 |
Supplemental Executive Retirement Plan | Debt Securities | Quoted Prices In Active Markets (Level 1) | Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets |  | 832
Supplemental Executive Retirement Plan | Debt Securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 853 |
Supplemental Executive Retirement Plan | Debt Securities | Level 2 | Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets |  | 781
Supplemental Executive Retirement Plan | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 221 |
Supplemental Executive Retirement Plan | Cash and Cash Equivalents | Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets |  | 323
Supplemental Executive Retirement Plan | Cash and Cash Equivalents | Measured At Net Asset Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 54 |
Supplemental Executive Retirement Plan | Cash and Cash Equivalents | Measured At Net Asset Value | Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets |  | 72
Supplemental Executive Retirement Plan | Cash and Cash Equivalents | Quoted Prices In Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 15 |
Supplemental Executive Retirement Plan | Cash and Cash Equivalents | Quoted Prices In Active Markets (Level 1) | Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets |  | 15
Supplemental Executive Retirement Plan | Cash and Cash Equivalents | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | $ 152 |
Supplemental Executive Retirement Plan | Cash and Cash Equivalents | Level 2 | Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets |  | $ 236

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