Stock-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2014
Stock-based compensation, additional disclosures
Common stock reserved for future issuance or settlement (in shares)	6,300,000		6,300,000
Weighted Average Grant Date Fair Value
Payments related to tax withholding			$ 2,574,000	$ 4,237,000
Stock Options
General award terms
Award vesting period			4 years
Weighted average assumptions
Weighted average fair value (in dollars per share)		$ 10.86	$ 13.64	$ 11.33
Risk-free interest rate (as a percent)			1.50%	1.30%
Expected dividend yield (as a percent)			0.00%	0.00%
Expected life			4 years 6 months	4 years 7 months 6 days
Expected volatility factor (as a percent)			35.00%	39.30%
Stock options activity
Outstanding, beginning of period (in shares)			1,246,528
Granted (in shares)	0		281,085
Exercised (in shares)			(112,417)
Cancelled / Forfeited (in shares)			(24,058)
Outstanding, end of period (in shares)	1,391,138		1,391,138		1,246,528
Vested and exercisable, end of period (in shares)	800,889		800,889
Vested and expected to vest, end of period (in shares)	1,314,255		1,314,255
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)			$ 20.30
Granted (in dollars per share)			$ 43.44
Exercised (in dollars per share)			$ 13.48
Cancelled / Forfeited (in dollars per share)			$ 25.22
Outstanding, end of period (in dollars per share)	$ 25.44		$ 25.44		$ 20.30
Vested and exercisable, end of period (in dollars per share)	$ 19.50		$ 19.50
Vested and expected to vest, end of period (in dollars per share)	$ 25.00		$ 25.00
Weighted Average Remaining Contractual Term
Outstanding, end of period			7 years 4 months 6 days		7 years 1 month 21 days
Vested and exercisable, end of period			6 years 5 months 5 days
Vested and expected to vest, end of period			7 years 3 months 11 days
Aggregate Intrinsic Value
Outstanding, end of period	15,574,000		15,574,000		32,543,000
Vested and exercisable, end of period	12,831,000		12,831,000
Vested and expected to vest, end of period	15,342,000		15,342,000
Weighted Average Grant Date Fair Value
Total unrecognized compensation cost	5,900,000		5,900,000
Total unrecognized compensation cost, period of recognition			2 years 9 months 18 days
Total intrinsic value of options exercised	700,000	2,700,000	3,000,000	9,200,000
Cash proceeds from option exercises			1,500,000	4,400,000
Stock Options | Minimum
General award terms
Contractual terms			7 years
Stock Options | Maximum
General award terms
Contractual terms			10 years
Restricted Stock Units
General award terms
Award vesting period			4 years
Stock options activity
Granted (in shares)	0
Restricted stock units activity
Outstanding, beginning of period (in shares)			617,269
Granted (in shares)			331,742
Settled (in shares)			(211,020)
Cancelled / Forfeited (in shares)			(27,197)
Outstanding, end of period (in shares)	710,794		710,794
Vested and expected to vest (in shares)	617,512		617,512
Weighted Average Grant Date Fair Value
Outstanding, beginning of period (in dollars per share)			$ 25.74
Granted (in dollars per share)		$ 38.10	$ 43.44	$ 32.61
Settled (RSUs) (in dollars per share)			$ 27.51
Cancelled / Forfeited (in dollars per share)			$ 25.45
Outstanding, end of period (in dollars per share)	$ 33.49		$ 33.49
Vested and expected to vest, end of period (in dollars per share)			$ 33.58
Total fair value of shares vested from RSU grants	3,500,000	5,000,000	7,700,000	12,200,000
Total unrecognized compensation cost	20,600,000		20,600,000
Total unrecognized compensation cost, period of recognition			2 years 9 months 18 days
Payments related to tax withholding			$ 2,700,000	$ 4,200,000