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Postretirement Health Care Plan - Additional Information (Detail)
 9 Months Ended
Jan. 27, 2017
Compensation And Retirement Disclosure [Abstract]  
Defined benefit plan, description of plan amendment In November 2016, we made certain amendments to the ERM Plan, which prior to amendment, provided group health insurance benefits to eligible retirees. Effective January 1, 2017, the amended ERM Plan provides each eligible retiree with a capped reimbursement of premiums for the period from January 1, 2017 through December 31, 2019. During the period from December 31, 2019 through December 31, 2021, participants in the ERM Plan will be eligible to receive a lump sum cash payment equal to two years of projected health care costs, or a prorated portion thereof, pursuant to the methodology set forth in the ERM Plan.