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Change in Allowance for Doubtful Accounts (Detail) (USD $)
In Thousands, unless otherwise specified

3 Months Ended

Apr. 30, 2013

Apr. 30, 2012

Allowance for Doubtful Accounts Receivable [Roll Forward]

Beginning balance

$ 5,331

$ 4,432

Charged to expense

(500)

153

(79)

^[1]

(48)

^[1]

$ 4,752

$ 4,537

[1]	Specific account write-offs and foreign exchange.

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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