Share-based Compensation (Shares Reserved for Issuance) (Details) - shares shares in Thousands	Dec. 31, 2017	Jun. 30, 2017
Class Of Stock [Line Items]
Shares reserved for issuance	29,659	25,140
2014 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Shares reserved for issuance	6,517	7,785
Employee Stock Options and Awards Outstanding
Class Of Stock [Line Items]
Shares reserved for issuance	10,900	9,726
2013 Equity Incentive Plan Shares Available for Grant
Class Of Stock [Line Items]
Shares reserved for issuance	12,242	7,629