Accumulated other comprehensive loss (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 28, 2020	Mar. 30, 2019	Mar. 31, 2018
Rollforward of the amounts included in AOCI, net of taxes
Balance beginning of period	$ (26,132)
Balance end of period	(36,295)	$ (26,132)
Unrecognized net actuarial loss included in accumulated other comprehensive income	(2,611)	(1,833)
Pension liability adjustment
Rollforward of the amounts included in AOCI, net of taxes
Balance beginning of period	(1,833)	(1,793)	$ (1,444)
Other comprehensive (loss) income before reclassifications, net of tax	(835)	(92)	(398)
Amounts reclassified to earnings, net of tax	57	52	49
Net current period other comprehensive (loss) income	(778)	(40)	(349)
Balance end of period	(2,611)	(1,833)	(1,793)
Foreign currency translation
Rollforward of the amounts included in AOCI, net of taxes
Balance beginning of period	(23,332)	(15,421)	(21,044)
Other comprehensive (loss) income before reclassifications, net of tax	(4,789)	(7,911)	5,623
Net current period other comprehensive (loss) income	(4,789)	(7,911)	5,623
Balance end of period	(28,121)	(23,332)	(15,421)
Accumulated other comprehensive (loss) income
Rollforward of the amounts included in AOCI, net of taxes
Balance beginning of period	(26,132)	(17,316)	(22,643)
Other comprehensive (loss) income before reclassifications, net of tax	(11,705)	(10,200)	6,428
Amounts reclassified to earnings, net of tax	1,542	1,384	(1,101)
Net current period other comprehensive (loss) income	(10,163)	(8,816)	5,327
Balance end of period		(26,132)	(17,316)
Foreign currency hedge instruments
Rollforward of the amounts included in AOCI, net of taxes
Balance beginning of period	(967)	(102)	(155)
Other comprehensive (loss) income before reclassifications, net of tax	(6,081)	(2,197)	1,203
Amounts reclassified to earnings, net of tax	1,485	1,332	(1,150)
Net current period other comprehensive (loss) income	(4,596)	(865)	53
Balance end of period	$ (5,563)	$ (967)	$ (102)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan.

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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