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Earnings Per Share ("EPS") (Narrative) (Details)
12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Equity-based compensation awards, excluded from computation of dilutive earnings per share 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 6,236us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 9,456us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount