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Nature of business and summary of significant accounting policies - Foreign currency forward contracts (Details) $ in Thousands		12 Months Ended
	Dec. 29, 2019 USD ($)	Mar. 28, 2020 USD ($) item	Mar. 30, 2019 USD ($)	Mar. 31, 2018 USD ($)
Impairment of long lived assets		$ 0
Self-insured liabilities
Self-insurance reserves recorded in accrued liabilities		$ 2,532	$ 2,835
Goodwill
Number of reporting units \| item		2
Impairment charges for goodwill	$ 0	$ 0	$ 0	$ 0
Foreign currency forward contracts
Minimum term period of currency-related hedge instruments		1 month	1 month
Maximum term period of currency-related hedge instruments		12 months	12 months
Recent accounting pronouncements
Liabilities		$ 895,106	$ 484,051
Assets		1,166,814	$ 748,744	749,369
ASU 2016-02 \| Adjustment
Recent accounting pronouncements
Liabilities		352,059
Assets		$ 352,059
Elfa
Foreign currency translation
Exchange rate from Swedish Krona to U.S. Dollar		9.3	9.9
Carrying amounts of net assets		$ 105,396	$ 108,674
Selling, general & administrative
Foreign currency translation
Realized gains/losses		167	(60)	596
Trade names
Trade names
Impairment charge	$ 0	$ 0	$ 0	$ 0