Quarterly Results (Unaudited) (Tables)

12 Months Ended

Mar. 31, 2013

Quarterly Results (Unaudited) [Abstract]

Summary of unaudited quarterly results of operations

The following is a summary of unaudited quarterly results of operations for each of the quarters in the two fiscal years ended March 31, 2012 and 2013:

	Revenues		Gross Profit		Net Income		Net Income per Basic Common Share		Net Income per Diluted Common Share
Fiscal Year Ended March 31, 2012:
First Quarter	$	102,307,000	$	25,544,000	$	8,198,000	$	0.71	$	0.70
Second Quarter		104,552,000		25,612,000		7,881,000		0.68		0.68
Third Quarter		101,382,000		21,226,000		5,400,000		0.47		0.47
Fourth Quarter		104,427,000		21,460,000		5,073,000		0.45		0.44
Fiscal Year Ended March 31, 2013:
First Quarter	$	104,606,000	$	23,181,000	$	6,596,000	$	0.58	$	0.58
Second Quarter		105,458,000		22,836,000		6,630,000		0.59		0.58
Third Quarter		107,287,000		21,734,000		5,924,000		0.53		0.53
Fourth Quarter		111,959,000		23,909,000		7,580,000		0.70		0.70