Correction of Immaterial Errors Statement of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	$ 5,265	$ (678)	$ 4,209	$ (5,127)	$ (4,917)	$ 1,862	$ 6,037	$ 2,923	$ 3,669	$ 5,905	$ 19,915
Comprehensive income (loss), net									$ (2,744)	(7,263)	9,116
Timing and Recognition of Certain Transactions [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income										5,905
As Previously Reported [Member] | Timing and Recognition of Certain Transactions [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income										8,264	22,444
Comprehensive income (loss), net										(4,904)	11,645
Revision Adjustment [Member] | Timing and Recognition of Certain Transactions [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income										(2,359)	(2,529)
Comprehensive income (loss), net										$ (2,359)	$ (2,529)