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COMMITMENTS AND CONTINGENCIES: (Tables)
12 Months Ended
Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases
Future minimum lease payments under all noncancellable operating leases as of March 31, 2019 are (dollars in thousands):
Year ending March 31,
2020 $12,057 
2021 11,253 
2022 10,865 
2023 5,160 
2024 3,270 
Thereafter4,497 
$47,102