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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Apr. 30, 2018
Apr. 30, 2017
Business Acquisition [Line Items]        
Net cash provided by operating activities $ 14,724 $ 15,747    
Net cash provided by investing activities 43,918 (68,598)    
Net cash provided by financing activities (54,394) 23,565    
Net increase (decrease) in cash, cash equivalents   0    
Net increase (decrease) in cash, cash equivalents, and restricted cash 4,248 (29,286)    
Cash and cash equivalents 16,261 $ 11,891 $ 0
Restricted cash 4,103 3,713 4,225  
Total cash, cash equivalents and restricted cash 20,364 27,514 $ 16,116 56,800
Escrow Deposits [Member]        
Business Acquisition [Line Items]        
Restricted cash $ 4,100      
Previously Reported [Member]        
Business Acquisition [Line Items]        
Net cash provided by operating activities   15,828    
Net cash provided by investing activities   (44,544)    
Net cash provided by financing activities   23,698    
Net increase (decrease) in cash, cash equivalents   (5,018)    
Net increase (decrease) in cash, cash equivalents, and restricted cash   0    
Cash and cash equivalents   23,801   28,819
Total cash, cash equivalents and restricted cash       0
Accounting Standards Update 2016-15 [Member] | Adjustment [Member]        
Business Acquisition [Line Items]        
Net cash provided by operating activities   (81)    
Net cash provided by investing activities   (24,054)    
Net cash provided by financing activities   (133)    
Net increase (decrease) in cash, cash equivalents   5,018    
Net increase (decrease) in cash, cash equivalents, and restricted cash   (29,286)    
Cash and cash equivalents     (28,819)
Total cash, cash equivalents and restricted cash   $ 3,713   $ 56,800