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Stock-Based Compensation and Incentive Plans - Additional Information (Detail) | 12 Months Ended |
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Mar. 31, 2016 USD ($) $ / shares shares | Mar. 31, 2015 $ / shares shares | Mar. 31, 2014 USD ($) d Installment / yr $ / shares shares | Mar. 31, 2013 USD ($) d $ / shares shares | Mar. 01, 2013 $ / shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Options outstanding | shares | 1,777,124 | 1,709,206 | 1,370,056 | 1,556,275 |
Intrinsic value of options outstanding | $ 0 |  |  |  |
Intrinsic value of options exercisable | $ 0 |  |  |  |
Fair value of non-vested shares | $ / shares | $ 23.58 | $ 39.53 | $ 48.68 |  | $ 50.48
Director stock payment period, units | d |  |  | 15 | 15 |
Director |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Value of stock units granted |  |  | $ 115,000 | $ 100,000 |
Minimum |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Option expiration period | 3 months |  |  |  |
Optional payment installments, annual | Installment / yr |  |  | 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 |  |
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 | $ 2,800,000 |  |  |  |
Total unrecognized stock compensation costs, net of tax | 1,900,000 |  |  |  |
Restricted Stock |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Total unrecognized stock compensation costs | 0 |  |  |  |
Total unrecognized stock compensation costs, net of tax | $ 0 |  |  |  |
Time-based stock vesting period, years | 4 years |  |  |  |
Fair value of non-vested shares | $ / shares |  | 56.94 | $ 54.75 | $ 50.95 |
Restricted Stock Units (RSUs) |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Total unrecognized stock compensation costs | $ 5,200,000 |  |  |  |
Total unrecognized stock compensation costs, net of tax | $ 3,900,000 |  |  |  |
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 | shares | 89,456 |  |  |  |
Restricted Stock Units (RSUs) | Performance Based Restricted Stock Awards |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share based compensation outstanding number | shares | 69,546 |  |  |  |
Restricted Stock Units (RSUs) | Performance Based Shares |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Fair value of non-vested shares | $ / shares | $ 61.75 | 53.58 | 53.58 | 69.62 |
Phantom Stock Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Total unrecognized stock compensation costs | $ 10,800,000 |  |  |  |
Total unrecognized stock compensation costs, net of tax | $ 8,300,000 |  |  |  |
Fair value of non-vested shares | $ / shares | $ 10.83 | 24.07 | $ 50.94 | $ 51.74 |
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 | 596,464 |  |  |  |
Phantom Stock Plan | Performance Based Shares |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share based compensation outstanding number | shares | 1,291 |  |  |  |
Phantom Stock Plan | Non-Vested Shares |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Fair value of non-vested shares | $ / shares | $ 6.83 |  |  |  |
Phantom Stock Plan | Minimum |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
General vesting period, years | 3 years |  |  |  |
Phantom Stock Plan | Maximum |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
General vesting period, years | 4 years |  |  |  |
Cash-based Performance Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Total unrecognized stock compensation costs | $ 6,300,000 |  |  |  |
Total unrecognized stock compensation costs, net of tax | $ 4,300,000 |  |  |  |
Share based compensation outstanding number | shares | 0 |  |  |  |
Fair value of non-vested shares | $ / shares | $ 1.16 | 1.10 |  |  |
Cash-based Performance Plan | Maximum |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Units awarded, vesting rights amount | $ / shares |  | $ 2 |  |  |

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