Convertible Senior Notes - Narrative (Details)	Nov. 12, 2014 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) $ / shares	Jun. 30, 2015
Debt Instrument [Line Items]
Share price (in dollars per share)		$ 189.25
Proceeds from issuance of warrants | $	$ 167,300,000
Warrants sold, shares authorized to sell to counterparties | shares	4,490,020
Warrants sold, exercise price of shares authorized to sell to counterparties (in dollars per share)	$ 381.82
Class A Common Stock [Member] | Options Held [Member]
Debt Instrument [Line Items]
Payments for convertible note hedges | $	$ 248,000,000
Hedging activity, shares covered | shares	4,490,020
Hedging activity, strike price (in dollars per share)	$ 294.54
Convertible Debt [Member]
Debt Instrument [Line Items]
Note payable | $	$ 1,322,500,000.000000
Interest rate	0.50%	0.50%	0.50%
Conversion ratio	0.0033951
Conversion price per share (in dollars per share)	$ 294.54
Warrants sold, exercise price of shares authorized to sell to counterparties (in dollars per share)	$ 381.82
Cumulative dilutive effect when price of stock exceeds conversion price, additional dilution at declining rate after hedging activity, actual shares diluted (in shares) | shares	115,000
Cumulative dilutive effect when price of stock exceeds conversion price, additional dilution at declining rate after hedging activity, actual diluted share price (in dollars per share)	$ 391.82
Convertible Debt [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Estimated fair value of Notes | $		$ 1,306,100,000
Convertible Debt [Member] | Class A Common Stock [Member]
Debt Instrument [Line Items]
Conversion price per share (in dollars per share)	$ 294.54
Share price (in dollars per share)		$ 189.25