Commitments and Contingencies Commitments and Contingencies (Details) - USD ($)	12 Months Ended
	Apr. 29, 2017	Apr. 30, 2016	May 02, 2015
Loss Contingencies [Line Items]
Operating Leases, Rent Expense, Minimum Rentals	$ 165,980	$ 140,743	$ 125,388
Operating Leases, Rent Expense, Contingent Rentals	87,843	101,552	106,011
Operating Leases, Rent Expense, Net	$ 253,823	$ 242,295	$ 231,399
Minimum Rent Expense Description	Our contracts with colleges and universities are typically five years with renewal options, but can range from one to 15 years, 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 65% 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	$ 140,417
Operating Leases, Future Minimum Payments, Due in Two Years	133,514
Operating Leases, Future Minimum Payments, Due in Three Years	123,811
Operating Leases, Future Minimum Payments, Due in Four Years	116,153
Operating Leases, Future Minimum Payments, Due in Five Years	104,486
Operating Leases, Future Minimum Payments, Due Thereafter	207,807
Operating Leases, Future Minimum Payments Due	826,188
Purchase Obligation, Due in Next Twelve Months	3,124
Purchase Obligation, Due in Second and Third Year	3,000
Purchase Obligation, Due in Fourth and Fifth Year	175
Purchase Obligation	$ 6,299