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Stock-Based Compensation and Incentive Plans - Additional Information (Detail) | 12 Months Ended |
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Mar. 31, 2017 USD ($) Installment $ / shares shares | Mar. 31, 2015 $ / shares shares | Mar. 31, 2014 USD ($) Installment / yr $ / shares shares | Mar. 31, 2013 USD ($) | Mar. 31, 2016 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Options outstanding | shares | 1,395,548 | 1,709,206 | 1,370,056 |  | 1,777,124
Intrinsic value of options outstanding | $ 0 |  |  |  |
Intrinsic value of options exercisable | $ 0 |  |  |  |
Fair value of non-vested shares | $ / shares | $ 24.19 | $ 39.53 | $ 48.68 |  | $ 23.58
Director stock payment period |  |  | 15 days | 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 |  |  |  |
Minimum |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Option expiration period | 3 months |  |  |  |
Optional payment installments, annual | Installment / yr |  |  | 2 |  |
Minimum | Deferred Cash Award |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Optional payment installments, annual | Installment | 2 |  |  |  |
Maximum |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Option expiration period | 10 years |  |  |  |
Optional payment installments, annual | Installment / yr |  |  | 10 |  |
Maximum | Deferred Cash Award |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Optional payment installments, annual | Installment | 10 |  |  |  |
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 |  |  |  |
Total unrecognized stock compensation costs | $ 1,500,000 |  |  |  |
Total unrecognized stock compensation costs, net of tax | $ 1,100,000 |  |  |  |
Restricted Stock |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Time-based stock vesting period, years | 4 years |  |  |  |
Fair value of non-vested shares | $ / shares |  | 56.94 | $ 54.75 |  |
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 | shares | 183 |  |  |  |
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 | $ 1,100,000 |  |  |  |
Total unrecognized stock compensation costs, net of tax | $ 800,000 |  |  |  |
Fair value of non-vested shares | $ / shares | $ 9.74 | 24.07 | $ 50.94 |  | 10.83
Phantom Stock Plan | Time Based Restricted Stock Awards |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share based compensation outstanding number | shares | 566,638 |  |  |  |
Phantom Stock Plan | Non-Vested Shares |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Fair value of non-vested shares | $ / shares | $ 1.15 |  |  |  |
Cash-based Performance Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Total unrecognized stock compensation costs | $ 2,100,000 |  |  |  |
Total unrecognized stock compensation costs, net of tax | $ 1,400,000 |  |  |  |
Share based compensation outstanding number | shares | 4,296,392 |  |  |  |
Fair value of non-vested shares | $ / shares | $ 1.16 | 1.10 |  |  | $ 1.16
Cash-based Performance Plan | Maximum |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Units awarded, vesting rights amount | $ / shares |  | $ 2 |  |  |
2017 Stock Incentive Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Percentage of common equity available for grant | 8.00% |  |  |  |
2017 Stock Incentive Plan | Time-based Restricted Stock Units |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Percentage of common equity available for grant | 3.00% |  |  |  |
Option expiration period | 30 days |  |  |  |
2017 Stock Incentive Plan | Available for Future Grants |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Percentage of common equity available for grant | 5.00% |  |  |  |

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