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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Net number of non-option equity instruments granted to participants.

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Name:	nx_ShareBasedCompensationAwardPerformanceCriteriaAxis=nx_ShareBasedCompensationAwardPerformanceCriteriaAbsoluteTotalShareholderReturnMilestonesLessThanNegative20PercentMember
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Stock Based Compensation (Detail) - USD ($) $ / shares in Units, $ in Thousands					12 Months Ended
	Dec. 05, 2019	Nov. 30, 2019	Dec. 05, 2018	Dec. 07, 2017	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Stock Options, [Roll Forward]
Outstanding at beginning of period (in shares)					1,416,186	1,753,656	2,152,758
Granted (in shares)					0	0	0
Exercised (in shares)					(215,733)	(204,770)	(377,218)
Forfeited/Expired (in shares)					(105,124)	(132,700)	(21,884)
Outstanding at end of period (in shares)					1,095,329	1,416,186	1,753,656	2,152,758
Vested or expected to vest at end of period					1,095,329
Exercisable at end of period					1,095,329
Weighted Average Exercise Price Per Share
Outstanding at beginning of period (in dollars per share)					$ 18.71	$ 18.47	$ 17.44
Granted (in dollars per share)					0	0	0
Exercised (in dollars per share)					17.09	15.76	12.58
Forfeited/Expired (in dollars per share)					20.28	20.01	19.28
Outstanding at end of period (in dollars per share)					18.88	$ 18.71	$ 18.47	$ 17.44
Vested or expected to vest at end of period					18.88
Exercisable at end of period					$ 18.88
Weighted Average Remaining Contractual Life
Outstanding at end of period					3 years 7 months 6 days	4 years 2 months 12 days	5 years	5 years 2 months 12 days
Vested or expected to vest at end of period					3 years 7 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value					$ 561
Aggregate Intrinsic Value
Outstanding at end of period					561	$ 1,449	$ 51	$ 9,700
Vested or expected to vest at end of period					$ 561
Additional Disclosures [Abstract]
Number of shares authorized, originally					3,139,895
Vesting period					3 years
Total intrinsic value of options exercised					$ 500	$ 400	2,900
Performance shares settled in cash					100.00%	50.00%
Performance shares settled in stock						50.00%
Total compensation expense					$ 1,166	$ 3,965	1,022
Income tax effect					274	997	(35)
Net compensation expense					892	2,968	1,057
EPS	$ 0		$ 0	$ 20.70
R-TSR	0		0	21.81
Return On Net Assets	$ 19.40		$ 13.63	$ 0
Payment For Settlement Of Share-Based Compensation					$ 200	$ 400	$ 0
Restricted stock
Number of Shares
Period start, non-vested (in shares)					230,100	217,200	284,300
Granted (in shares)					63,400	124,800	73,400
Vested (in shares)					(51,000)	(42,500)	(111,800)
Forfeited (in shares)					(55,000)	(69,400)	(28,700)
Period end, non-vested (in shares)					187,500	230,100	217,200	284,300
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Period start, non-vested (in dollars per share)					$ 17.02	$ 19.76	$ 19.66
Grant Date Fair Value (in dollars per share)					18.82	13.78	20.70
Vested in Period, Weighted Average Grant Date Fair Value (in dollars per share)					17.30	17.87	20.16
Forfeitures, Weighted Average Grant Date Fair Value (in dollars per share)					19.45	19.19	19.66
Period end, non-vested (in dollars per shares)					$ 16.82	$ 17.02	$ 19.76	$ 19.66
Additional Disclosures [Abstract]
Vesting period					3 years
Fair value of restricted stock awards vested					$ 1,100	$ 1,300	$ 2,300
Unrecognized compensation cost - non vested restricted stock awards					$ 1,200
Weighted-average period over which unrecognized cost is expected to be recognized					1 year 8 months 12 days
Total compensation expense					$ 625	1,018	1,462
Stock options
Additional Disclosures [Abstract]
Vesting period					3 years
Expiration period					10 years
Fair value of stock options vested					$ 600	1,100	1,500
Total compensation expense					$ 10	$ 158	$ 467
Restricted Stock Units (RSUs)
Number of Shares
Period start, non-vested (in shares)					4,616
Vested (in shares)					(25,621)	(34,050)	(18,050)
Period end, non-vested (in shares)					21,774	4,616
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Vested in Period, Weighted Average Grant Date Fair Value (in dollars per share)					$ 18.18	$ 15.51	$ 21.85
Additional Disclosures [Abstract]
Vesting period					3 years
Total compensation expense					$ 186	$ 950	$ (364)
Performance Shares
Number of Shares
Vested (in shares)		(56,103)
Additional Disclosures [Abstract]
Vesting period					3 years
Total compensation expense					$ (170)	1,131	(944)
Performance shares granted	55,900		131,500	146,500
Performance shares forfeited	5,300		40,900	54,008
Payment For Settlement Of Share-Based Compensation		$ 600
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period		28,051
Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Grant Date Fair Value (in dollars per share)	$ 19.40		$ 13.63	$ 17.76
Additional Disclosures [Abstract]
Vesting period					3 years
Total compensation expense					$ 515	$ 708	$ 401
Performance shares granted	35,000		89,200	78,200
Performance shares forfeited	0		25,500	28,854
Minimum
Additional Disclosures [Abstract]
Performance shares vesting percentage					0.00%
Minimum \| Performance Restricted Stock Units
Additional Disclosures [Abstract]
Performance shares vesting percentage					0.00%
Maximum
Additional Disclosures [Abstract]
Performance shares vesting percentage					200.00%
Maximum \| Performance Restricted Stock Units
Additional Disclosures [Abstract]
Performance shares vesting percentage					150.00%
Share-based Compensation Award, Tranche One [Member] \| Performance Restricted Stock Units
Additional Disclosures [Abstract]
Performance shares vesting percentage					150.00%
Share-based Compensation Award, Tranche One [Member] \| Share-Based Compensation Award, Performance Criteria, Absolute Total Shareholder Return Milestones, Greater Than Or Equal To 50 Percent [Member] \| Performance Restricted Stock Units
Additional Disclosures [Abstract]
Performance shares vesting percentage					150.00%
Share-based Compensation Award, Tranche Two [Member] \| Performance Restricted Stock Units
Additional Disclosures [Abstract]
Performance shares vesting percentage					100.00%
Share-based Compensation Award, Tranche Two [Member] \| Share-Based Compensation Award, Performance Criteria, Absolute Total Shareholder Return Milestones, Less Than 50 Percent And Greater Than Or Equal To 20 Percent [Member] \| Performance Restricted Stock Units
Additional Disclosures [Abstract]
Performance shares vesting percentage					100.00%
Share-based Compensation Award, Tranche Three [Member] \| Performance Restricted Stock Units
Additional Disclosures [Abstract]
Performance shares vesting percentage					50.00%
Share-based Compensation Award, Tranche Three [Member] \| Share-Based Compensation Award, Performance Criteria, Absolute Total Shareholder Return Milestones, Less Than 20 Percent And Greater Than Or Equal To Negative 20 Percent [Member] \| Performance Restricted Stock Units
Additional Disclosures [Abstract]
Performance shares vesting percentage					50.00%
Share-Based Compensation Award, Tranche Four [Member] \| Performance Restricted Stock Units
Additional Disclosures [Abstract]
Performance shares vesting percentage					0.00%
Share-Based Compensation Award, Tranche Four [Member] \| Share-Based Compensation Award, Performance Criteria, Absolute Total Shareholder Return Milestones, Less Than Negative 20 Percent [Member] \| Performance Restricted Stock Units
Additional Disclosures [Abstract]
Performance shares vesting percentage					0.00%