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Basis of Presentation, Business and Summary of Significant Accounting Policies - Revision of Previously Issued Statements of Cash Flows (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Apr. 30, 2016
Cash flows from investing activities:      
Acquisition of business, net of cash acquired $ (3,124) $ (26,582)  
Cash used in investing activities (7,211) (28,348)  
Cash flows from financing activities:      
Cash provided by financing activities $ 6,533 49,724  
As previously reported      
Cash flows from investing activities:      
Acquisition of business, net of cash acquired   (23,278)  
Cash used in investing activities   (25,044)  
Cash flows from financing activities:      
Cash paid for contingent consideration   (3,304)  
Cash provided by financing activities   46,420  
Correction for misstatement of cash flows related to payments of working capital settlements      
Cash flows from financing activities:      
Cash paid for contingent consideration     $ 6,598
Correction for misstatement of cash flows related to payments of working capital settlements | Adjustment      
Cash flows from investing activities:      
Acquisition of business, net of cash acquired   (3,304)  
Cash used in investing activities   (3,304)  
Cash flows from financing activities:      
Cash paid for contingent consideration   3,304  
Cash provided by financing activities   $ 3,304