Share-based Compensation (Shares Reserved for Issuance) (Details) - shares shares in Thousands	Sep. 30, 2018	Jun. 30, 2018
Class Of Stock [Line Items]
Shares reserved for issuance	24,124	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	12,236	12,060
2013 Equity Incentive Plan Shares Available for Grant
Class Of Stock [Line Items]
Shares reserved for issuance	7,804	9,957