Share-Based Compensation Expense (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 30, 2012 Y	Oct. 31, 2011
Summarizes information with respect to stock options outstanding
Range of Exercise Price, Lower (in dollars per share)	$ 0.94
Range of Exercise Price, Upper (in dollars per share)	$ 268
Number of Underlying Shares, Options Outstanding	3,422
Weighted Average, Outstanding Options Remaining Contractual Life (Years)	3.23
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 27.82	$ 30.01
Aggregate Intrinsic Value, Options Outstanding	$ 2,303
Number of Underlying Shares, Vested Options	3,345
Weighted Average, Vested Options Remaining Contractual Life (Years)	3.14
Weighted Average Exercise Price, Vested Options (in dollars per share)	$ 28.19
Aggregate Intrinsic Value, Vested Options	1,988
Range of Exercise Price 0.94 to 16.31 [Member]
Summarizes information with respect to stock options outstanding
Range of Exercise Price, Lower (in dollars per share)	$ 0.94
Range of Exercise Price, Upper (in dollars per share)	$ 16.31
Number of Underlying Shares, Options Outstanding	348
Weighted Average, Outstanding Options Remaining Contractual Life (Years)	5.59
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 8.47
Aggregate Intrinsic Value, Options Outstanding	2,303
Number of Underlying Shares, Vested Options	280
Weighted Average, Vested Options Remaining Contractual Life (Years)	5.21
Weighted Average Exercise Price, Vested Options (in dollars per share)	$ 8.00
Aggregate Intrinsic Value, Vested Options	1,988
Range of Exercise Price 16.52 to 17.29 [Member]
Summarizes information with respect to stock options outstanding
Range of Exercise Price, Lower (in dollars per share)	$ 16.52
Range of Exercise Price, Upper (in dollars per share)	$ 17.29
Number of Underlying Shares, Options Outstanding	397
Weighted Average, Outstanding Options Remaining Contractual Life (Years)	3.19
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 16.68
Aggregate Intrinsic Value, Options Outstanding	0
Number of Underlying Shares, Vested Options	393
Weighted Average, Vested Options Remaining Contractual Life (Years)	3.15
Weighted Average Exercise Price, Vested Options (in dollars per share)	$ 16.68
Aggregate Intrinsic Value, Vested Options	0
Range of Exercise Price 17.43 to 24.50 [Member]
Summarizes information with respect to stock options outstanding
Range of Exercise Price, Lower (in dollars per share)	$ 17.43
Range of Exercise Price, Upper (in dollars per share)	$ 24.5
Number of Underlying Shares, Options Outstanding	549
Weighted Average, Outstanding Options Remaining Contractual Life (Years)	2.98
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 20.48
Aggregate Intrinsic Value, Options Outstanding	0
Number of Underlying Shares, Vested Options	546
Weighted Average, Vested Options Remaining Contractual Life (Years)	2.97
Weighted Average Exercise Price, Vested Options (in dollars per share)	$ 20.48
Aggregate Intrinsic Value, Vested Options	0
Range of Exercise Price 24.69 to 28.28 [Member]
Summarizes information with respect to stock options outstanding
Range of Exercise Price, Lower (in dollars per share)	$ 24.69
Range of Exercise Price, Upper (in dollars per share)	$ 28.28
Number of Underlying Shares, Options Outstanding	415
Weighted Average, Outstanding Options Remaining Contractual Life (Years)	4.45
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 26.98
Aggregate Intrinsic Value, Options Outstanding	0
Number of Underlying Shares, Vested Options	415
Weighted Average, Vested Options Remaining Contractual Life (Years)	4.45
Weighted Average Exercise Price, Vested Options (in dollars per share)	$ 26.98
Aggregate Intrinsic Value, Vested Options	0
Range of Exercise Price 28.61 to 31.43 [Member]
Summarizes information with respect to stock options outstanding
Range of Exercise Price, Lower (in dollars per share)	$ 28.61
Range of Exercise Price, Upper (in dollars per share)	$ 31.43
Number of Underlying Shares, Options Outstanding	274
Weighted Average, Outstanding Options Remaining Contractual Life (Years)	3.38
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 29.77
Aggregate Intrinsic Value, Options Outstanding	0
Number of Underlying Shares, Vested Options	272
Weighted Average, Vested Options Remaining Contractual Life (Years)	3.37
Weighted Average Exercise Price, Vested Options (in dollars per share)	$ 29.77
Aggregate Intrinsic Value, Vested Options	0
Range of Exercise Price 31.71 to 32.55 [Member]
Summarizes information with respect to stock options outstanding
Range of Exercise Price, Lower (in dollars per share)	$ 31.71
Range of Exercise Price, Upper (in dollars per share)	$ 32.55
Number of Underlying Shares, Options Outstanding	520
Weighted Average, Outstanding Options Remaining Contractual Life (Years)	0.81
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 31.72
Aggregate Intrinsic Value, Options Outstanding	0
Number of Underlying Shares, Vested Options	520
Weighted Average, Vested Options Remaining Contractual Life (Years)	0.81
Weighted Average Exercise Price, Vested Options (in dollars per share)	$ 31.72
Aggregate Intrinsic Value, Vested Options	0
Range of Exercise Price 33.00 to 37.10 [Member]
Summarizes information with respect to stock options outstanding
Range of Exercise Price, Lower (in dollars per share)	$ 33
Range of Exercise Price, Upper (in dollars per share)	$ 37.1
Number of Underlying Shares, Options Outstanding	347
Weighted Average, Outstanding Options Remaining Contractual Life (Years)	5.04
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 35.17
Aggregate Intrinsic Value, Options Outstanding	0
Number of Underlying Shares, Vested Options	347
Weighted Average, Vested Options Remaining Contractual Life (Years)	5.04
Weighted Average Exercise Price, Vested Options (in dollars per share)	$ 35.18
Aggregate Intrinsic Value, Vested Options	0
Range Of Exercise Price 37.31 to 47.32 [Member]
Summarizes information with respect to stock options outstanding
Range of Exercise Price, Lower (in dollars per share)	$ 37.31
Range of Exercise Price, Upper (in dollars per share)	$ 47.32
Number of Underlying Shares, Options Outstanding	505
Weighted Average, Outstanding Options Remaining Contractual Life (Years)	2.39
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 44.71
Aggregate Intrinsic Value, Options Outstanding	0
Number of Underlying Shares, Vested Options	505
Weighted Average, Vested Options Remaining Contractual Life (Years)	2.39
Weighted Average Exercise Price, Vested Options (in dollars per share)	$ 44.71
Aggregate Intrinsic Value, Vested Options	0
Range Of Exercise Price 47.53 to 167.09 [Member]
Summarizes information with respect to stock options outstanding
Range of Exercise Price, Lower (in dollars per share)	$ 47.53
Range of Exercise Price, Upper (in dollars per share)	$ 55.79
Number of Underlying Shares, Options Outstanding	65
Weighted Average, Outstanding Options Remaining Contractual Life (Years)	0.67
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 48.81
Aggregate Intrinsic Value, Options Outstanding	0
Number of Underlying Shares, Vested Options	65
Weighted Average, Vested Options Remaining Contractual Life (Years)	0.67
Weighted Average Exercise Price, Vested Options (in dollars per share)	$ 48.81
Aggregate Intrinsic Value, Vested Options	0
Range Of Exercise Price 267.52 to 267.52 [Member]
Summarizes information with respect to stock options outstanding
Range of Exercise Price, Lower (in dollars per share)	$ 268
Range of Exercise Price, Upper (in dollars per share)	$ 268
Number of Underlying Shares, Options Outstanding	2
Weighted Average, Outstanding Options Remaining Contractual Life (Years)	0.40
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 267.52
Aggregate Intrinsic Value, Options Outstanding	0
Number of Underlying Shares, Vested Options	2
Weighted Average, Vested Options Remaining Contractual Life (Years)	0.4
Weighted Average Exercise Price, Vested Options (in dollars per share)	$ 267.52
Aggregate Intrinsic Value, Vested Options	$ 0