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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Apr. 30, 2013
Jan. 31, 2013
Apr. 30, 2012
Accounts receivable, allowance for doubtful accounts $ 1,274 $ 1,681 $ 1,799
Preferred shares, par value $ 0.0001 $ 0.0001 $ 0.0001
Preferred shares, shares authorized 10,000,000 10,000,000 10,000,000
Preferred shares, shares issued         
Common shares, par value $ 0.0001 $ 0.0001 $ 0.0001
Common shares, shares authorized 200,000,000 200,000,000 200,000,000
Common shares, shares issued 146,813,217 146,015,767 144,808,807
Common shares, shares outstanding 146,813,217 146,015,767 144,808,807