LONG-TERM DEBT (Details)		1 Months Ended				12 Months Ended
	Nov. 07, 2018 USD ($)	Nov. 30, 2018 USD ($)	Nov. 30, 2018 USD ($)	Apr. 30, 2016 USD ($) shares $ / shares	Jan. 31, 2015 USD ($) shares $ / shares	Oct. 31, 2018 USD ($)	Oct. 29, 2017 USD ($)	Oct. 30, 2016 USD ($)	Mar. 31, 2011 USD ($)
Long-term debt [Abstract]
Long-term debt and capital lease obligations						$ 57,453,000	$ 61,976,000
Less: current portion						57,453,000	4,639,000
Long-term debt and capital lease obligations non current						0	57,337,000
Interest payments						1,900,000	2,100,000	$ 3,200,000
3.25% Convertible Senior Notes due in April 2019 [Member]
Long-term debt [Abstract]
Convertible debt						$ 57,453,000	57,337,000
Interest rate percentage						3.25%
Maturity date of debt						Apr. 01, 2019
Face amount of debt						$ 57,500,000
Number of shares each note is convertible to (in shares) | shares					96
Face amount of each note converted					$ 1,000
Conversion price per share (in dollars per share) | $ / shares					$ 10.37
3.25% Convertible Senior Notes due in April 2016 [Member]
Long-term debt [Abstract]
Interest rate percentage				3.25%
Maturity date of debt				Apr. 01, 2016
Face amount of debt									$ 57,500,000
Repayments of convertible debt				$ 50,100,000
Conversion of debt to common stock (in shares) | shares				700,000
Number of shares each note is convertible to (in shares) | shares				96
Face amount of each note converted				$ 1,000
Conversion price per share (in dollars per share) | $ / shares				$ 10.37
2.77% Capital Lease Obligation Payable through July 2018 [Member]
Long-term debt [Abstract]
Long-term debt and capital lease obligations						$ 0	$ 4,639,000
Interest rate percentage						2.77%
Maturity date of debt						Jul. 31, 2018
Face amount of debt						$ 26,400,000
Term of loan agreement						5 years
Periodic payments						$ 500,000
Frequency of periodic payment						per month
Project Loan Agreement [Member] | Subsequent Event [Member]
Long-term debt [Abstract]
Maximum borrowing capacity		$ 50,000,000	$ 50,000,000
Term of loan agreement		8 years
Working Capital Loan Agreement [Member] | Subsequent Event [Member]
Long-term debt [Abstract]
Date of loan agreement	Nov. 07, 2018
Maximum borrowing capacity	$ 25,000,000
Proceeds from line of credit			$ 2,200,000
Working Capital Loan Agreement [Member] | Subsequent Event [Member] | Maximum [Member]
Long-term debt [Abstract]
Term of loan agreement	3 years
Amended and Restated Credit Agreement [Member]
Long-term debt [Abstract]
Maturity date of debt						Sep. 30, 2023
Maximum borrowing capacity						$ 100,000,000
Current borrowing capacity						50,000,000
Amount outstanding under credit facility						0
Available borrowing capacity						$ 50,000,000
Effective interest rate						2.30%