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ACQUISITIONS - Narrative (Details) - USD ($)
2 Months Ended 12 Months Ended
Jan. 18, 2022
Jul. 17, 2019
Mar. 31, 2022
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Business Acquisition [Line Items]            
Business combination, value of stock issued       $ 80,856,000 $ 0 $ 0
Wavecell Pte. Ltd.            
Business Acquisition [Line Items]            
Business combination, consideration transferred   $ 117,100,000        
Payments to acquire businesses, gross   72,800,000        
Business combination, value of stock issued   $ 44,300,000        
Fuze            
Business Acquisition [Line Items]            
Business combination, consideration transferred $ 213,800,000          
Payments to acquire businesses, gross $ 132,900,000          
Percentage of interests acquired (in percent) 100.00%          
Cash held back in consideration transferred $ 1,300,000          
Number of shares held back in consideration transferred (in shares) 1,153,523          
Earnings (loss) of acquiree since acquisition     $ (700,000)      
Goodwill, expected to be tax deductible $ 0          
Fair value of acquired receivables 15,100,000          
Gross contractual amount 29,600,000          
Uncollectable gross contractual amount 14,500,000          
Business combination, acquisition related costs       $ 9,700,000    
Fuze | Common Stock            
Business Acquisition [Line Items]            
Business combination, value of stock issued $ 80,900,000          
Fuze | Service            
Business Acquisition [Line Items]            
Revenue of acquiree since acquisition     23,900,000      
Fuze | Other revenue            
Business Acquisition [Line Items]            
Revenue of acquiree since acquisition     $ 200,000