NET INCOME PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Numerator:
Net income	$ 4,988	$ 2,850	$ 20,761	$ 8,385
Denominator:
Weighted average common shares outstanding - basic (in shares)	21,968,000	21,672,000	21,902,000	22,213,000
Weighted average effect of dilutive securities:
Stock options (in shares)	87,000	107,000	101,000	139,000
Restricted stock units (in shares)	258,000	185,000	285,000	212,000
Warrants (in shares)	28,000	26,000	28,000	15,000
Weighted average common shares outstanding - diluted (in shares)	22,341,000	21,990,000	22,316,000	22,579,000
Net income per share:
Basic net income per share (in dollars per share)	$ 0.23	$ 0.13	$ 0.95	$ 0.38
Diluted net income per share (in dollars per share)	$ 0.22	$ 0.13	$ 0.93	$ 0.37
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of shares underlying antidilutive securities (in shares)	0	307,000	31,000	249,000
Restricted stock unit awards (performance vesting) not included in the diluted net income per share calculation (in shares)	21,000		21,000
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of shares underlying antidilutive securities (in shares)	0	0	0	0
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of shares underlying antidilutive securities (in shares)	0	0	0	0