Pension Plan - Additional Information (Detail) - USD ($)		9 Months Ended	12 Months Ended
	Dec. 28, 2017	Nov. 30, 2017	Feb. 28, 2017	Feb. 28, 2018
Defined Benefit Plan Disclosure [Line Items]
Employees covered under noncontributory Pension Plan		20.00%
Compensation period preceding retirement and termination		5 years
Period used for calculating Pension Plan liability		25 years
Cash contribution to the pension plan			$ 3,000,000
Scenario Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum required contribution to the plan is approximately				$ 0
Subsequent Event [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash contribution to the pension plan	$ 3,000,000