Organization and Significant Accounting Policies - Contract Estimates (Details) - USD ($)	3 Months Ended	6 Months Ended
	Oct. 27, 2018	Oct. 27, 2018	Oct. 26, 2019
Organization and Significant Accounting Policies
Material adjustment to any one contract	$ 0	$ 0
Amount of revised aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods	$ 976,000	$ 976,000	$ 1,118,000