Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) $ / shares in Units, shares in Millions, $ in Millions, Doses in Billions						3 Months Ended	12 Months Ended
	Sep. 06, 2016 $ / shares shares	Jun. 06, 2016 $ / shares shares	Jun. 02, 2015 $ / shares shares	Mar. 09, 2015 $ / shares shares	Jul. 17, 2014	Sep. 30, 2014 USD ($) shares	Jun. 30, 2017 USD ($) segment Doses customer	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	[1]	Jul. 31, 2014 $ / shares
Other Assets, Noncurrent | $							$ 27.5	$ 67.1
Stockholders' Equity Note, Stock Split, Conversion Ratio					70
Stock Issued During Period, Shares, New Issues | shares						48.9
Share Price | $ / shares											$ 20.50
Proceeds from Issuance Initial Public Offering | $						$ 952.2
Gain (Loss) on Contract Termination | $							$ 0.0	$ 0.0	$ 29.8
Sale of Stock, Number of Shares, Underwriters Option to Purchase | shares			2.1	3.6
Number of Doses | Doses							72
Number of Customers | customer							7,000
Number of Reportable Segments | segment							3
Blackstone [Member]
Share Price | $ / shares	$ 23.85	$ 24.85	$ 29.00	$ 29.50
Sale of Stock, Number of Shares Sold by Entity | shares	19.0	10.0	16.1	27.3

[1] The Company paid a sponsor advisory agreement termination fee of $29.8 million in connection with its IPO.