NET INCOME PER SHARE - Calculations of Basic and Diluted Net Income Per Share and Potential Common Shares (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Numerator:
Net income	$ 11,476	$ 5,253
Denominator:
Denominator for basic net income per share - weighted average common shares outstanding	41,081	41,405
Dilutive common equivalent shares:
Weighted average stock options (in shares)	17	85
Weighted average restricted stock units (in shares)	710	578
Denominator for diluted net income per share - weighted average shares outstanding (in shares)	41,808	42,068
Net income per share:
Basic net income per share (in dollars per share)	$ 0.28	$ 0.13
Diluted net income per share (in dollars per share)	$ 0.27	$ 0.12