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Financial Instruments - Summary of Net Cash Position (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Apr. 01, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Disclosure of detailed information about financial instruments [abstract]          
Cash and cash equivalents $ 85,444 $ 99,829 $ 99,829 $ 69,803 $ 41,854
Investments 150,400   121,502    
Long-term debt (includes current portion) (61,800)   (89,900)    
Net cash position $ 174,044   $ 131,431