Retirement Plans - Additional Information (Details) - USD ($) $ in Millions		9 Months Ended
	Mar. 22, 2017	Feb. 28, 2017	Feb. 29, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Contributions By Employer		$ 1,750	$ 495
Subsequent Event [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected payments to former employees in fourth quarter of 2017	$ 1,000
March 2017 contribution [Member] | Subsequent Event [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Contributions By Employer	250
Defined benefit pension plan, required employer contribution	$ 15