Employee Benefit Plans (Common Stock Reserved for Future Issuance) (Details) - shares shares in Thousands	Dec. 31, 2020	Jun. 30, 2020
Class Of Stock [Line Items]
Shares reserved for issuance	24,540	30,878
2014 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Shares reserved for issuance	5,913	7,364
Employee Stock Options and Awards Outstanding
Class Of Stock [Line Items]
Shares reserved for issuance	12,478	10,396
2013 Equity Incentive Plan Shares Available for Grant
Class Of Stock [Line Items]
Shares reserved for issuance	6,149	13,118