QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2020	Aug. 02, 2020	May 03, 2020	Feb. 02, 2020	Oct. 31, 2019	Jul. 28, 2019	Apr. 28, 2019	Jan. 27, 2019	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Selected Quarterly Financial Data (Unaudited) [Abstract]
Revenue	$ 149,286	$ 157,895	$ 142,774	$ 159,736	$ 156,256	$ 138,112	$ 131,580	$ 124,712	$ 609,691	$ 550,660	$ 535,276
Gross profit	31,885	37,734	30,433	34,602	38,159	30,570	26,010	26,102	134,654	120,841	131,503
Net income	8,579	12,864	7,972	10,928	13,037	9,834	9,852	7,768	40,343	40,491	61,236
Net income attributable to Photronics, Inc. shareholders	$ 6,460	$ 10,776	$ 6,284	$ 10,300	$ 9,700	$ 6,347	$ 8,479	$ 5,267	$ 33,820	$ 29,793	$ 42,055
Earnings per share [Abstract]
Basic (in dollars per share)	$ 0.10	$ 0.17	$ 0.10	$ 0.16	$ 0.15	$ 0.10	$ 0.13	$ 0.08	$ 0.52	$ 0.45	$ 0.61
Diluted (in dollars per share)	$ 0.10	$ 0.17	$ 0.10	$ 0.16	$ 0.15	$ 0.10	$ 0.13	$ 0.08	$ 0.52	$ 0.44	$ 0.59