Stockholders' Equity (Details)	0 Months Ended	3 Months Ended		6 Months Ended		0 Months Ended			3 Months Ended			0 Months Ended		6 Months Ended
	Mar. 21, 2013 RSUs	Mar. 31, 2014 RSUs	Dec. 31, 2013 RSUs	Mar. 31, 2014 RSUs	Mar. 31, 2014 RSUs Expected	Mar. 01, 2014 Time-based RSUs item	Dec. 12, 2013 Time-based RSUs item	Mar. 21, 2013 Time-based RSUs item	Mar. 31, 2014 Time-based RSUs First installment	Mar. 31, 2014 Time-based RSUs Second installment	Mar. 31, 2014 Time-based RSUs Third installment	Dec. 12, 2013 Performance-based RSUs	Mar. 21, 2013 Performance-based RSUs	Mar. 31, 2014 Performance-based RSUs item
Stockholders' Equity
Number of units awarded (in shares)		21,158	263,506			21,158	110,812	264,549				152,694	161,962
Number of units awarded (in shares)				711,175
Number of shares of common stock that each award holder has the contingent right to receive	1
Number of equal installments for vesting of stock awards						3	4	4
Vesting percentage of award									27.00%	33.00%	40.00%
Vesting period														3 years
Number of vesting criteria's which has to be satisfied out of total vesting criteria's														1
Number of vesting criteria's														3
Awards vested (in shares)			69,994		363,311