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Stock-Based Compensation and Incentive Plans - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 16, 2018 | Jul. 31, 2017 | Dec. 31, 2017 | Mar. 31, 2017 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Option awards outstanding |  |  | 0 |  |  |  |  |
Director stock payment period |  |  |  |  |  |  | 15 days |
Deferred Cash Award |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Interest rate, applicable margin to 10 year Treasury note |  |  |  | 1.50% |  |  |  |
Distribution payment period |  |  |  | 15 days |  |  |  |
Director |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Value of stock units granted |  |  |  |  |  | $ 115,000 | $ 100,000 |
Director | Deferred Cash Award |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Value of cash awards granted |  |  |  | $ 97,750 |  |  |  |
2017 Stock Incentive Plan | Plan of Reorganization |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
General vesting period, years |  | 3 years |  |  |  |  |  |
Deferred Stock Unit Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
New awards have been issued |  |  |  |  |  |  |  | 0
Minimum |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Option expiration period |  |  | 3 months |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Option expiration period |  |  | 10 years |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
General vesting period, years |  |  | 3 years |  |  |  |  |
Post retirement period to exercise vested options |  |  | 2 years |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total unrecognized stock compensation costs |  |  | $ 24,500,000 |  |  |  |  |
Total unrecognized stock compensation costs, net of tax |  |  | $ 18,200,000 |  |  |  |  |
Restricted Stock Units (RSUs) | Time Based Restricted Stock Awards |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share based compensation outstanding number |  |  | 418,301 |  |  |  |  |
Restricted Stock Units (RSUs) | 2017 Stock Incentive Plan | Plan of Reorganization | Director |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
General vesting period, years |  | 1 year |  |  |  |  |  |
Restricted Stock Units (RSUs) | 2017 Stock Incentive Plan | Plan of Reorganization | CEO | Scenario, Forecast |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
General vesting period, years | 1 year |  |  |  |  |  |  |
Phantom Stock Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
General vesting period, years |  |  | 3 years |  |  |  |  |
Total unrecognized stock compensation costs |  |  | $ 300,000 |  |  |  |  |
Total unrecognized stock compensation costs, net of tax |  |  | $ 200,000 |  |  |  |  |
New awards issued |  |  | 0 |  |  |  |  |
Phantom Stock Plan | Series A |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of non-vested shares |  |  | $ 1.00 |  |  |  |  |
New awards have been issued |  |  | 21,934 |  |  |  |  |
Phantom Stock Plan | Series B |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of non-vested shares |  |  | $ 0.98 |  |  |  |  |
New awards have been issued |  |  | 23,712 |  |  |  |  |
Phantom Stock Plan | Time Based Restricted Stock Awards |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share based compensation outstanding number |  |  | 34,525 |  |  |  |  |
Fair value of non-vested shares |  |  | $ 308.24 |  |  |  |  |
New awards have been issued |  |  | 13,526 |  |  |  |  |
Phantom Stock Plan | Non-Vested Shares |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of non-vested shares |  |  | $ 24.40 |  |  |  |  |
Phantom Stock Plan | Non-Vested Shares | Series A |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of non-vested shares |  |  | 2.38 |  |  |  |  |
Phantom Stock Plan | Non-Vested Shares | Series B |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of non-vested shares |  |  | $ 2.08 |  |  |  |  |
Cash-based Performance Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share based compensation outstanding number |  |  | 0 |  |  |  |  |
Cash-based Performance Plan | Maximum |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Units awarded, vesting rights amount |  |  |  |  | $ 2 |  |  |

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