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Revenues - Incremental Costs of Obtaining a Contract with a Customer (Details)
3 Months Ended
Sep. 30, 2018
USD ($)
Revenue from Contract with Customer [Abstract]  
Capitalized contract cost, amortization period 6 years
Capitalized Contract Cost [Roll Forward]  
Capitalized costs to obtain a contract as of July 1, 2018 $ 35,151,000
New capitalized costs incurred 3,179,000
Amortization of capitalized costs (2,271,000)
Capitalized costs to obtain a contract as of September 30, 2018 36,059,000
Impairment loss $ 0