Commitments and Contingencies Commitments and Contingencies (Details) - USD ($)	12 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Loss Contingencies [Line Items]
Operating Leases, Rent Expense, Minimum Rentals	$ 170,351	$ 165,980	$ 140,743
Operating Leases, Rent Expense, Contingent Rentals	80,630	87,843	101,552
Operating Leases, Rent Expense, Net	$ 250,981	$ 253,823	$ 242,295
Minimum Rent Expense Description	Our contracts with colleges and universities are typically five years with renewal options and are typically cancelable by either party without penalty with 90 to120 days' notice. Annual projections below are based on current minimum guarantee amounts. In approximately 69% of our contracts with colleges and universities that include minimum guarantees, the minimum guaranteed amounts adjust annually to equal less than the prior year's commission earned.
Operating Leases, Future Minimum Payments Receivable, Current	$ 139,994
Operating Leases, Future Minimum Payments, Due in Two Years	130,794
Operating Leases, Future Minimum Payments, Due in Three Years	124,379
Operating Leases, Future Minimum Payments, Due in Four Years	113,419
Operating Leases, Future Minimum Payments, Due in Five Years	105,034
Operating Leases, Future Minimum Payments, Due Thereafter	192,741
Operating Leases, Future Minimum Payments Due	806,361
Purchase Obligation, Due in Next Twelve Months	5,201
Purchase Obligation, Due in Second and Third Year	1,979
Purchase Obligation, Due in Fourth and Fifth Year	107
Purchase Obligation	$ 7,287