Organization and Description of Business (Narrative) (Detail) $ / shares in Units, $ in Millions			12 Months Ended
	Oct. 22, 2014 USD ($) $ / shares shares	Oct. 09, 2014	Jun. 30, 2015 USD ($) $ / shares shares	Mar. 31, 2015 USD ($) $ / shares shares	Oct. 10, 2014 $ / shares shares	Jun. 30, 2014 $ / shares shares
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Stock split ratio		223,000
Common stock, shares outstanding			243,008,679		223,000,000	223,000,000
Common stock, shares issued			243,008,679	4,000,000		223,000,000
Common stock, par value | $ / shares			$ 0.001	$ 27.35	$ 0.001	$ 0.001
Common Stock, Value, Outstanding | $				$ 105.2
Net proceeds from IPO, after deducting underwriting discounts and other offering expenses. | $			$ 387.2
IPO [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Proceeds from issuance of common stock, shares	24,079,002
Shares Issued, Price Per Share | $ / shares	$ 19.00
Net proceeds from IPO, after deducting underwriting discounts and other offering expenses. | $	$ 282.0
IPO [Member] | Parent Company
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Proceeds from issuance of common stock, shares	16,008,679
IPO [Member] | Majority Shareholder
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Proceeds from issuance of common stock, shares	8,070,323
Over Allotment Option [Member] | Majority Shareholder
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Net proceeds from IPO, after deducting underwriting discounts and other offering expenses. | $	$ 150.2