Share Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended						12 Months Ended
	Mar. 25, 2013	Jan. 31, 2014 Plans	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2014 Director [Member]	Jan. 31, 2014 2010 Stock Incentive Plan [Member]	May 22, 2012 2010 Stock Incentive Plan [Member]	Jan. 31, 2014 2010 Stock Incentive Plan [Member] Restricted Stock Units (RSUs) [Member]	Jan. 31, 2014 2010 Stock Incentive Plan [Member] Time-vested RSUs [Member]	Jan. 31, 2014 2010 Stock Incentive Plan [Member] Performance-based RSUs [Member]	Jan. 31, 2014 2010 Stock Incentive Plan [Member] Performance-based RSUs [Member] Minimum [Member]	Jan. 31, 2014 2010 Stock Incentive Plan [Member] Performance-based RSUs [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share based compensation plans		2
Shares reserved for grant under the plan					100,000		2,000,000
Remaining shares available for grant						900,761
Maximum exercise period						10 years
Granted, number of options (in shares)	198,900	198,900
Award vesting period		4 years							3 years	3 years
Expiration period		5 years
Intrinsic value of options exercised		$ 3,019	$ 2,573	$ 2,362
Total compensation cost for non-vested awards not yet recognized in the Company's statements of income		3,216
Weighted average period to recognize costs associated with non-vested awards in years		2 years 3 months 9 days						1 year 9 months 26 days
Granted (in shares)					7,700				25,540	56,222
Performance shares target award											0.00%	150.00%
Percentage of target award										100.00%
Total unrecognized compensation cost net of estimated forfeitures								$ 3,169