Commitments and Contingencies Commitments and Contingencies (Details) - USD ($)	12 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Loss Contingencies [Line Items]
Operating Leases, Rent Expense, Minimum Rentals	$ 169,131	$ 170,351	$ 165,980
Operating Leases, Rent Expense, Contingent Rentals	73,368	80,630	87,843
Operating Leases, Rent Expense, Net	$ 242,499	$ 250,981	$ 253,823
Minimum Rent Expense Description	Our physical bookstore management 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. The annual projections below are based on current minimum guarantee amounts. In approximately 72% of our physical bookstore management 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	$ 138,523
Operating Leases, Future Minimum Payments, Due in Two Years	133,741
Operating Leases, Future Minimum Payments, Due in Three Years	120,327
Operating Leases, Future Minimum Payments, Due in Four Years	113,518
Operating Leases, Future Minimum Payments, Due in Five Years	99,693
Operating Leases, Future Minimum Payments, Due Thereafter	161,090
Operating Leases, Future Minimum Payments Due	766,892
Purchase Obligation, Due in Next Twelve Months	4,262
Purchase Obligation, Due in Second and Third Year	1,819
Purchase Obligation, Due in Fourth and Fifth Year	32
Purchase Obligation	$ 6,113