Long-term debt and revolving lines of credit - Revolving Credit Facility (Details) $ in Thousands			12 Months Ended
	Sep. 14, 2018 USD ($)	Apr. 06, 2012 USD ($)	Mar. 28, 2020 USD ($)	Mar. 30, 2019 USD ($)	Mar. 31, 2018 USD ($)
Long-term debt and revolving lines of credit
Net amount of borrowings on revolving credit facility			$ 115,000	$ 331,500	$ 335,000
Revolving credit facility
Long-term debt and revolving lines of credit
Maximum borrowing capacity		$ 100,000
Amount of increase in commitments upon such request from the Company		50,000
Net amount of borrowings on revolving credit facility	$ 10,000
Swing line advances limit		15,000
Letter of credit facility sub-limit		$ 40,000
Percentage of eligible credit card receivables used for determining total amount of availability			90.00%
Percentage of appraised value of eligible inventory used for determining total amount of availability			90.00%
Consolidated fixed-charge coverage ratio to be maintained if excess availability is less than $10,000 at any time			1.0
Amount of dividend payable during term of debt			$ 15,000
Amount of availability under facility			15,022
Line of credit, draw down			118,648
Revolving credit facility | LIBOR
Long-term debt and revolving lines of credit
Interest rate margin (as a percent)		1.25%
Revolving credit facility | Minimum
Long-term debt and revolving lines of credit
Amount of dividend payable during term of debt			$ 12,500
Threshold fixed charge coverage ratio for payment of dividend			1.10
Revolving credit facility | Maximum
Long-term debt and revolving lines of credit
First priority security interest in stock in foreign subsidiaries (as a percent)			65.00%
Threshold amount of excess availability for which consolidated fixed-charge coverage ratio of 1.0 to 1.0 is to be maintained			$ 10,000