Summary of Significant Accounting Policies - Revenue Recognition, Expenses and Shipping and Handling Costs (Details) - USD ($)	12 Months Ended
	Mar. 28, 2021	Mar. 29, 2020	Mar. 31, 2019
Shipping and Handling Costs
Shipping and handling costs	$ 10,036,100	$ 10,222,800	$ 11,647,700
Income Taxes
Cumulative amount of interest and penalties related to tax uncertainties	$ 0	$ 0	$ 0
Maximum
Revenue Recognition
Revenue recorded on net fee basis (as a percent)	1.00%