Net Income (Loss) Per Share - Schedule of Weighted-Average Shares Used for Net Income (Loss) per Share (Parenthetical) (Detail) - Common Stock [Member] - $ / shares	Aug. 04, 2018	Jun. 30, 2018	Jun. 30, 2015	Jun. 30, 2014
Convertible Senior Notes Due 2019 [Member]
Earnings Per Share Diluted [Line Items]
Conversion price per share	$ 116.09			$ 116.09
Convertible Senior Notes Due 2020 [Member]
Earnings Per Share Diluted [Line Items]
Conversion price per share	118.13		$ 118.13
Convertible Senior Notes Due 2023 [Member]
Earnings Per Share Diluted [Line Items]
Conversion price per share	$ 193.65	$ 193.65