Retirement Plans - Significant Assumptions Used to Determine Net Periodic Benefit Cost (Detail) |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
Mar. 31, 2015 |
|
| United States Plans | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Discount rate | 3.90% | 3.80% | 4.50% |
| Expected return on plan assets | 7.00% | 7.00% | 7.80% |
| International Plans | Minimum | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Discount rate | 1.80% | 1.25% | 3.00% |
| Expected return on plan assets | 3.30% | 3.20% | 4.40% |
| Rate of compensation increase | 1.50% | 1.50% | 2.00% |
| International Plans | Maximum | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Discount rate | 3.70% | 3.40% | 4.60% |
| Expected return on plan assets | 6.50% | 6.50% | 7.00% |
| Rate of compensation increase | 4.00% | 3.75% | 4.00% |