Summary of Significant Accounting Policies - Revenue Recognition, Expenses and Shipping and Handling Costs (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Apr. 01, 2018	Mar. 26, 2017
Shipping and Handling Costs
Shipping and handling costs	$ 16,534,200	$ 14,875,100	$ 14,179,700
Maximum
Revenue Recognition
Revenue recorded on net fee basis (as a percent)	1.00%
Service revenue (as a percent)	1.00%	1.00%	1.00%