Net Income Per Share - Schedule of Weighted-Average Shares Used for Net Income per Share Footnotes (Detail) - Common Stock - $ / shares	Nov. 02, 2019	Sep. 30, 2019	Jun. 30, 2018	Jun. 30, 2015	Jun. 30, 2014
Convertible senior notes due 2019
Earnings Per Share Diluted
Conversion price per share	$ 116.09				$ 116.09
Convertible senior notes due 2020
Earnings Per Share Diluted
Conversion price per share	118.13			$ 118.13
Convertible senior notes due 2023
Earnings Per Share Diluted
Conversion price per share	193.65		$ 193.65
Convertible senior notes due 2024
Earnings Per Share Diluted
Conversion price per share	$ 211.40	$ 211.40