NET INCOME PER COMMON SHARE (Schedule of Anti-Dilutive Shares) (Details) (USD $)	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Mar. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities	26,321,389	479,720
Unvested restricted stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities	153,529	30,143
Option to purchase common stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities	358,502	449,577
Common Stock Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities	12,904,679	0
2% Note, Due 2021 [Member] | Convertible Debt Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities	12,904,679	0
Convertible Senior Notes [Member] | 4% Notes, Due 2016 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion Price (usd per share)			$ 11.16