Significant Components of Benefit Obligation and Net Obligation Recognized in Financial Statements (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2009
Change in Plan Assets
Fair value of plan assets at end of year	$ 5,917	$ 5,589
Defined Benefit Plans
Change in benefit obligation
Benefit obligation at beginning of year	12,018	11,528
Service cost	46	44	42
Interest cost	569	592	811
Actuarial loss	944	1,126
Benefits and expenses paid	(1,502)	(1,272)
Benefit obligation at end of year	12,075	12,018	11,528
Change in Plan Assets
Fair value of plan assets at beginning of year	5,589	4,736
Actual return on plan assets	176	615
Employer contributions	1,654	1,510
Benefits and expenses paid	(1,502)	(1,272)
Fair value of plan assets at end of year	5,917	5,589	4,736
Unfunded status at end of year	(6,158)	(6,429)
Current liabilities	(1,001)	(1,001)
Non-current liabilities	(5,157)	(5,428)
Net obligation	(6,158)	(6,429)
Net obligation recognized in Balance Sheet	(6,158)	(6,429)
Defined Benefit Plans | Retained Earnings
Change in Plan Assets
Net obligation recognized in Balance Sheet	(3,765)	(4,936)
Defined Benefit Plans | Accumulated Other Comprehensive Income (Loss)
Change in Plan Assets
Net obligation recognized in Balance Sheet	(2,393)	(1,493)
Post-Retirement Benefit Plans
Change in benefit obligation
Benefit obligation at beginning of year	5,297	5,273
Service cost	13	15	12
Interest cost	256	281	276
Actuarial loss	329	143
Benefits and expenses paid	(300)	(415)
Benefit obligation at end of year	5,595	5,297	5,273
Change in Plan Assets
Employer contributions	300	415
Benefits and expenses paid	(300)	(415)
Unfunded status at end of year	(5,595)	(5,297)
Current liabilities	(301)	(277)
Non-current liabilities	(5,294)	(5,020)
Net obligation	(5,595)	(5,297)
Net obligation recognized in Balance Sheet	(5,595)	(5,297)
Post-Retirement Benefit Plans | Retained Earnings
Change in Plan Assets
Net obligation recognized in Balance Sheet	(5,315)	(5,347)
Post-Retirement Benefit Plans | Accumulated Other Comprehensive Income (Loss)
Change in Plan Assets
Net obligation recognized in Balance Sheet	$ (280)	$ 50