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Nature of business and summary of significant accounting policies - Revenue recognition (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Mar. 30, 2019	Apr. 01, 2018	Mar. 31, 2018
Recent accounting pronouncements
Retained Earnings (Accumulated Deficit)	$ (559,147)	$ (573,634)
Accrued Liabilities, Current	66,046	67,163
Inventory, Net	124,207	108,650
Other Assets, Current	$ 11,907	$ 11,705
ASU 2014-09
Recent accounting pronouncements
Retained Earnings (Accumulated Deficit)			$ 400
Accrued Liabilities, Current			$ (400)
Inventory, Net				$ (900)
Other Assets, Current				$ 900