Accounts Receivable - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended			9 Months Ended
	Jan. 31, 2010	Oct. 31, 2013	Jan. 31, 2013	Oct. 31, 2013 Minimum [Member]	Oct. 31, 2013 Maximum [Member]	Oct. 31, 2013 Construction Contracts Retainage [Member]	Jan. 31, 2013 Construction Contracts Retainage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract payment amounts retained by project owners						$ 16.9	$ 20.2
Length of retention period of amount given to project owners				14 months	28 months
Allowance for doubtful accounts		5.6	5.5
The amount of the net proceeds remaining from public auction of the partially completed project	$ 5.5