REVENUE, Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Oct. 31, 2019	Jul. 28, 2019	Apr. 28, 2019	Jan. 27, 2019	Oct. 31, 2018	Jul. 29, 2018	Apr. 29, 2018	[1]	Jan. 28, 2018	Oct. 31, 2019		Oct. 31, 2018		Oct. 29, 2017
Disaggregation of Revenue [Abstract]
Revenue	$ 156,256	$ 138,112	$ 131,580	$ 124,712	$ 144,660	$ 136,391	$ 130,779		$ 123,446	$ 550,660	[1]	$ 535,276	[1]	$ 450,678
Over Time [Member]
Disaggregation of Revenue [Abstract]
Revenue										497,942
At a Point in Time [Member]
Disaggregation of Revenue [Abstract]
Revenue										52,718
Taiwan [Member]
Disaggregation of Revenue [Abstract]
Revenue										244,377		237,039		187,818
Korea [Member]
Disaggregation of Revenue [Abstract]
Revenue										147,734		147,066		122,165
United States [Member]
Disaggregation of Revenue [Abstract]
Revenue										105,045		112,648		102,040
Europe [Member]
Disaggregation of Revenue [Abstract]
Revenue										32,585		35,540		36,081
China [Member]
Disaggregation of Revenue [Abstract]
Revenue										19,010		1,157		168
All Other Asia [Member]
Disaggregation of Revenue [Abstract]
Revenue										1,909		1,826		2,406
IC [Member]
Disaggregation of Revenue [Abstract]
Revenue										406,191		416,064		350,260
High-end [Member]
Disaggregation of Revenue [Abstract]
Revenue										156,418
Mainstream [Member]
Disaggregation of Revenue [Abstract]
Revenue										249,773
FPD [Member]
Disaggregation of Revenue [Abstract]
Revenue										144,469		$ 119,212		$ 100,418
High-end [Member]
Disaggregation of Revenue [Abstract]
Revenue										98,832
Mainstream [Member]
Disaggregation of Revenue [Abstract]
Revenue										$ 45,637

[1] Includes $0.6 million gain on sale of assets.