Pension Benefits (Narrative) (Details) - USD ($)		3 Months Ended	12 Months Ended
	Aug. 25, 2016	Jul. 31, 2016	Apr. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Expected company contributions to pension plan		$ 27,300,000
Pension contribution		$ 1,000,000	$ 5,000,000
Subsequent Event [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected company contributions to pension plan, discretionary funding	$ 20,000,000