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Note 6 (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2013
Apr. 30, 2012
Oct. 31, 2012
Cash Received From Subcontractors For Owner Controlled Insurance Program     $ 1.0 $ 0.9  
General Liability Insurance, Deductible 20   20   20
Bodily Injury Insurance, Deductible 0.25   0.25   0.10
Bodily Injury Insurance, Limit 5   5   5
Aggregate Retention for Construction Defects, Warranty and Bodily Injury Claims 21   21   21
Payments by Insurance Companies for Claims $ 7.5 $ 1.9 $ 8.5 $ 2.6