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Income Taxes - Reconciliation of Statutory Tax Rate of Parent Company to Effective Consolidated Tax Rate (Detail)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Income Tax Disclosure [Abstract]          
Statutory tax rate (in Israel) 21.00% 35.00% 23.00% 23.00% 23.00%
(Decrease) increase in effective tax rate due to:          
Utilization of net operating losses     2.60%   (0.40%)
FX on tax payments     0.80% 0.40% (0.30%)
Write-down and amortization of TNA transferred IP     0.10%    
Taxable capital gain     0.10%    
Non-deductible expenses (unrecognized income)     (0.10%)    
Change in deferred taxes due to change in tax rate     (0.30%)    
Taxes from prior years     (0.50%) (0.80%) 0.60%
Uncertain tax positions, net     (0.90%) (0.60%) 3.40%
Change in valuation allowance on deferred tax asset     (1.20%)    
Different tax rates applicable to non-Israeli subsidiaries     (2.50%) 1.30% 0.80%
Non-deductible portion of settlements     (23.60%)    
Net operating loss carryback       (1.30%)  
Tax benefits from reduced tax rates under benefit programs and other       (4.10%) (6.20%)
Effective consolidated tax rate     (2.50%) 17.90% 20.90%