Employee Benefit Plans (Shares Reserved for Issuance) (Details) - shares shares in Thousands	Dec. 31, 2018	Jun. 30, 2018
Class Of Stock [Line Items]
Shares reserved for issuance	23,219	27,382
2014 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Shares reserved for issuance	4,084	5,365
Employee Stock Options and Awards Outstanding
Class Of Stock [Line Items]
Shares reserved for issuance	11,577	12,060
2013 Equity Incentive Plan Shares Available for Grant
Class Of Stock [Line Items]
Shares reserved for issuance	7,558	9,957