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v3.19.1

Share-based Payments - Movements in Number of Performance Share Units Outstanding under 2006 and 2016 Incentive Award Plan and Related Weighted Average Fair Values (Detail) - PSUs [member] | 12 Months Ended
--- | ---
Mar. 31, 2019 USD ($) yr | Mar. 31, 2018 USD ($) yr | Mar. 31, 2017 USD ($) yr
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Beginning balance | 1,059,975 | 1,184,852 |
Granted | 199,303 | 400,463 |
Exercised | (297,052) | (506,660) |
Forfeited | (48,467) | (18,681) |
Ending balance | 913,759 | 1,059,975 | 1,184,852
Weighted average fair value, Beginning balance | $ 26.36 | $ 21.00 |
Exercisable | 272,977 |  |
Weighted average fair value, Granted | $ 47.54 | 30.35 |
Weighted average fair value, Exercised | 23.25 | 16.79 |
Weighted average fair value, Forfeited | 30.06 | 29.38 |
Weighted average fair value, Ending balance | 29.80 | $ 26.36 | $ 21.00
Weighted average fair value, exercisable | $ 21.91 |  |
Weighted average remaining contract term (in years) | yr | 7.13 | 7.51 | 7.36
Weighted average remaining contract term (in years), exercisable | yr | 5.59 |  |
Aggregate intrinsic value | $ 48,674,000 | $ 48,048,000 | $ 33,899,000
Aggregate intrinsic value, exercisable | $ 14,541,000 |  |

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