Stock-Based Compensation (Details) (USD $)	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Stock-based compensation, additional disclosures
Cash proceeds from option exercises	$ 4,048,000	$ 2,232,000
Payments related to tax withholding	1,976,000	1,187,000
Stock Options
General award terms
Award vesting period	4 years
Stock-based compensation accounting
Weighted average fair value of awards granted (in dollars per share)	$ 9.76	$ 6.46
Weighted average assumptions
Risk-free interest rate (as a percent)	0.60%	1.20%
Expected dividend yield (as a percent)	0.00%	0.00%
Expected life	4 years 10 months 24 days	4 years 7 months 6 days
Expected volatility factor (as a percent)	48.90%	49.60%
Stock options activity
Outstanding, beginning of period (in shares)	4,180,265
Granted (in shares)	494,336
Exercised (in shares)	(613,201)
Cancelled / Forfeited (in shares)	(31,300)
Outstanding, end of period (in shares)	4,030,100
Vested and exercisable (in shares)	2,735,799
Vested and expected to vest (in shares)	3,825,909
Stock options activity, additional disclosures
Weighted average exercise price, beginning of period (in dollars per share)	$ 9.03
Weighted average exercise price, granted (in dollars per share)	$ 23.38
Weighted average exercise price, exercised (in dollars per share)	$ 6.60
Weighted average exercise price, cancelled/forfeited (in dollars per share)	$ 8.95
Weighted average exercise price, end of period (in dollars per share)	$ 11.16
Weighted average exercise price, vested and exercisable (in dollars per share)	$ 8.44
Weighted average exercisable price, vested and expected to vest (in dollars per share)	$ 10.86
Weighted average remaining contractual term, outstanding, end of period	5 years 7 months 6 days
Weighted average remaining contractual term, vested and exercisable	4 years 1 month 17 days
Weighted average remaining contractual term, vested and expected to vest	5 years 5 months 1 day
Aggregate intrinsic value, outstanding, beginning of period	59,034,000
Aggregate intrinsic value, outstanding, end of period	59,169,000
Aggregate intrinsic value, vested and exercisable	47,612,000
Aggregate intrinsic value, vested and expected to vest	57,331,000
Stock-based compensation, additional disclosures
Total unrecognized compensation cost	8,300,000
Total unrecognized compensation cost, period of recognition	3 years
Total intrinsic value of options exercised	10,700,000	1,800,000
Cash proceeds from option exercises	4,000,000	2,200,000
Stock Options | Minimum
General award terms
Stock options contractual term	7 years
Stock Options | Maximum
General award terms
Stock options contractual term	10 years
Restricted Stock Units
General award terms
Award vesting period	4 years
Restricted stock units activity
Outstanding, beginning of period (in shares)	1,327,071
Granted (in shares)	583,059
Settled (in shares)	(256,846)
Cancelled / Forfeited (in shares)	(18,308)
Outstanding, end of period (in shares)	1,634,976
Vested and expected to vest (in shares)	1,417,833
Restricted stock units activity, additional disclosures
Weighted average grant date fair value, beginning of period (in dollars per share)	$ 12.73
Weighted average grant date fair value, granted (in dollars per share)	$ 23.38	$ 15.50
Weighted grant date fair value, settled (in dollars per share)	$ 13.86
Weighted average grant date fair value, cancelled/forfeited (in dollars per share)	$ 14.29
Weighted average grant date fair value, outstanding, end of period (in dollars per share)	$ 16.33
Weighted average grant date fair value, vested and expected to vest (in dollars per share)	$ 16.32
Total fair value of shares vested from RSU grants	6,300,000	3,800,000
Stock-based compensation, additional disclosures
Total unrecognized compensation cost	22,900,000
Total unrecognized compensation cost, period of recognition	3 years
Payments related to tax withholding	$ 2,000,000	$ 1,200,000
Equity compensation plans
Stock-based compensation, additional disclosures
Common stock reserved for future issuance or settlement under equity compensation (in shares)	10,200,000