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Income taxes - Change in Tax Rate (Details)

v3.5.0.2
Income taxes - Change in Tax Rate (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Apr. 01, 2020
Apr. 01, 2017
Dec. 31, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Income taxes            
Effect of changes in tax rates on Consolidated statement of Operations (in dollars)     $ 0      
Her Majesty's Revenue and Customs (HMRC)            
Income taxes            
Tax rate (as a percent)     20.00% 20.75% 22.50% 23.75%
Tax rate, deferred taxes (as a percent)     18.00%      
Her Majesty's Revenue and Customs (HMRC) | Forecast            
Income taxes            
Tax rate (as a percent) 18.00% 19.00%