Share-based Compensation (Narrative) (Details) (USD $)	6 Months Ended
	Mar. 31, 2013 Y
Share-based Compensation 1	800,000
Share-based Compensation 2	1,600,000
Share-based Compensation 3	400,000
Share-based Compensation 4	$ 31.25
Share-based Compensation 5	6
Share-based Compensation 6	40,000
Share-based Compensation 7	280,000
Share-based Compensation 8	300,300
Share-based Compensation 9	$ 19.68
Share-based Compensation 10	$ 1.18
Share-based Compensation 11	$ 10.75
Share-based Compensation 12	72,000
Share-based Compensation 13	$ 21.5
Share-based Compensation 14	5
Share-based Compensation 15	1.18
Share-based Compensation 16	$ 17.95
Share-based Compensation 17	216,000
Share-based Compensation 18	34,000
Share-based Compensation 19	$ 20.9
Share-based Compensation 20	5
Share-based Compensation 21	1.18
Share-based Compensation 22	$ 11.80
Share-based Compensation 23	12,548
Share-based Compensation 24	0
Share-based Compensation 25	136,912
Share-based Compensation 26	70,241
Share-based Compensation 27	385,640
Share-based Compensation 28	$ 14.05
Share-based Compensation 29	7
Share-based Compensation 30	1.18
Share-based Compensation 31	$ 12.30
Share-based Compensation 32	295,926
Share-based Compensation 33	156,823
Share-based Compensation 34	136,912
Share-based Compensation 35	70,241
Share-based Compensation 36	167,532
Share-based Compensation 37	1.5
Share-based Compensation 38	15,000
Share-based Compensation 39	$ 16.20
Share-based Compensation 40	7
Share-based Compensation 41	1.18
Share-based Compensation 42	$ 14.30
Share-based Compensation 43	15,136
Share-based Compensation 44	0
Share-based Compensation 45	6,427
Share-based Compensation 46	0
Share-based Compensation 47	20,000
Share-based Compensation 48	$ 12.15
Share-based Compensation 49	7.5
Share-based Compensation 50	1.18
Share-based Compensation 51	$ 7.05
Share-based Compensation 52	20,941
Share-based Compensation 53	7,330
Share-based Compensation 54	10,425
Share-based Compensation 55	2,820
Share-based Compensation 56	1,373
Share-based Compensation 57	100,000
Share-based Compensation 58	$ 14.05
Share-based Compensation 59	46,224
Share-based Compensation 60	24,278
Share-based Compensation 61	100,298
Share-based Compensation 62	54,232
Share-based Compensation 63	$ 60,464
Share-based Compensation 64	1.5