LONG-TERM DEBT (Details)	1 Months Ended		9 Months Ended
	Apr. 30, 2016 USD ($) shares $ / shares	Jan. 31, 2015 USD ($) shares $ / shares	Jul. 29, 2018 USD ($)	Oct. 29, 2017 USD ($)	Mar. 31, 2011 USD ($)
Long-term borrowings [Abstract]
Long-term debt and capital lease obligations			$ 57,893,000	$ 61,976,000
Current portion			(57,893,000)	(4,639,000)
Long-term debt and capital lease obligations non current			$ 0	57,337,000
Credit Facility [Member]
Long-term borrowings [Abstract]
Maturity date of debt			Dec. 31, 2018
Current borrowing capacity			$ 50,000,000
Maximum borrowing capacity			75,000,000
Amount outstanding under credit facility			0
Available borrowing capacity			$ 50,000,000
Interest rate			3.59%
3.25% Convertible Senior Notes due on April 2019 [Member]
Long-term borrowings [Abstract]
Convertible debt			$ 57,424,000	57,337,000
Face amount of debt			$ 57,500,000
Interest rate percentage			3.25%
Maturity date of debt			Apr. 01, 2019
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 borrowings [Abstract]
Face amount of debt					$ 57,500,000
Interest rate percentage	3.25%
Maturity date of debt	Apr. 01, 2016
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 borrowings [Abstract]
Long-term debt and capital lease obligations			$ 469,000	$ 4,639,000
Face amount of debt			$ 26,400,000
Interest rate percentage			2.77%
Maturity date of debt			Jul. 31, 2018
Repayment period of debt			5 years
Periodic payments			$ 500,000
Frequency of periodic payment			per month
Amount payable through the end of lease term			$ 500,000