Net Income per Common Share (Detail Textuals) - shares	1 Months Ended	3 Months Ended	6 Months Ended
	May. 01, 2015	Jul. 31, 2015	Jul. 31, 2015	Jul. 31, 2014
Earnings Per Share [Abstract]
Common stock excluded from the diluted net income per share calculation		163,707	161,884
Common stock issued in connection with exercise or vesting of equity awards			262,830	216,654
Stock split of common stock	two-for-one