Pension Plans - Additional Information (Detail) - USD ($) $ in Millions |
9 Months Ended | 12 Months Ended |
|---|---|---|
Feb. 28, 2017 |
May 31, 2016 |
|
| Pension Benefits, U.S. Plans | ||
| Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] | ||
| Contribution to retirement plans in the next fiscal year | $ 54.1 | |
| Contribution to retirement plans in the current remaining fiscal year | $ 54.1 | |
| Pension Benefits, Non-U.S. Plans | ||
| Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] | ||
| Contribution to retirement plans in the next fiscal year | $ 6.0 | |
| Contribution to retirement plans in the current remaining fiscal year | $ 6.0 |