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Summary of Business and Significant Accounting Policies - Practical expedients (Details)
6 Months Ended
Dec. 31, 2018
Summary of Business and Significant Accounting Policies  
Optional exemption not to disclose remaining transaction price false
Minimum period for completion of short-term professional services 3 months
Maximum period for completion of short-term professional services 6 months
Incremental cost of obtaining contract false