Net Income per Common Share (Detail Textuals) - shares	1 Months Ended	3 Months Ended		9 Months Ended
	May. 01, 2015	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Earnings Per Share [Abstract]
Common stock excluded from the diluted net income per share calculation		66,000	533,000	134,000	685,000
Common stock issued in connection with exercise or vesting of equity awards				262,830	606,236
Treasury stock issued in connection with exercise or vesting of equity awards				317,143
Stock split of common stock	two-for-one