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RETIREMENT PLANS: (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2019
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Defined Contribution Plan Disclosure [Line Items]        
Employer matching contribution, percent of match 100.00%      
Employer matching contribution, percent of employees' gross pay 6.00%      
Defined contribution plan cost   $ 10,100 $ 9,400 $ 7,900
Liabilities of non-qualified retirement plan   15,528 15,838  
Supplemental Non-Qualified Deferred Compensation Plan        
Defined Contribution Plan Disclosure [Line Items]        
Assets of non-qualified retirement plan   15,500 15,800  
Liabilities of non-qualified retirement plan   $ 15,500 $ 15,800