Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Income Tax Disclosure [Abstract]
Effective tax rate	44.50%	42.90%
Decrease in income tax provision	18.90%
Provision for income taxes	$ 10,818	$ 13,337
Effective tax rate reconciliation, percentage	35.00%