Retirement Benefits - Additional Information (Detail) - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
May 27, 2016 |
May 29, 2015 |
Feb. 29, 2016 |
|
| Defined Contribution Plan Disclosure [Line Items] | |||
| Liability for postretirement benefits other than pensions | $ 18.5 | $ 18.5 | $ 17.8 |
| Long-term liability for pension benefits | 79.0 | 80.3 | $ 80.2 |
| Profit Sharing and Benefit Plan 401 (k) [Member] | United States [Member] | |||
| Defined Contribution Plan Disclosure [Line Items] | |||
| Employer's contributions to a defined contribution retirement plan | $ 5.1 | $ 2.9 | |