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Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 05, 2018
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Business Acquisition [Line Items]          
Cash paid       $ 1,700  
Goodwill   $ 73,534   $ 73,534  
Effective income tax rate (as a percent)   18.20% 23.70% 14.70% (41.50%)
Apex Optimisation          
Business Acquisition [Line Items]          
Consideration transferred $ 23,000        
Cash paid $ 18,400        
Future contingent consideration payment   $ 4,600   $ 4,600  
Goodwill   15,959   $ 15,959  
Weighted average discount rate (as a percent)       28.00%  
Effective income tax rate (as a percent)       21.00%  
Developed Technology Rights | Apex Optimisation          
Business Acquisition [Line Items]          
Finite-lived intangible assets acquired   4,500   $ 4,500  
Finite-lived intangible asset, useful life       7 years  
Customer Relationship | Apex Optimisation          
Business Acquisition [Line Items]          
Finite-lived intangible assets acquired   $ 3,800   $ 3,800  
Finite-lived intangible asset, useful life       7 years