Long-Term Debt Payable to Banks - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended					12 Months Ended			12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2014 Revolving Credit Facility	Mar. 31, 2014 Revolving Credit Facility Maximum	Mar. 31, 2014 Revolving Credit Facility Unsecured Debt	Aug. 26, 2013 Revolving Credit Facility Unsecured Debt	Aug. 25, 2013 Former Senior Credit Facility	Mar. 31, 2014 Former Senior Credit Facility Line of Credit	Aug. 25, 2013 Former Senior Credit Facility Line of Credit	Aug. 31, 2008 Former Senior Credit Facility Term Loan
Line Of Credit Facility [Line Items]
Senior credit facility period						5 years
Senior credit facility							$ 20,000	$ 33,000		$ 10,000	$ 23,000
Revolving line of credit facility							35,000
Borrowing capacity ratio, maximum						may increase the amount to 2.5 times EBITDA
Option to convert Revolving Credit Facility, description						The Company has the option, subject to bank approval, during the five-year term of the Revolving Credit Facility, to convert the Facility to a secured credit facility which increases the borrowing limit to 3.5 times EBITDA (as defined in the Facility) up to a maximum of $35,000. As of March 31, 2014, the Company has not exercised this option
Unused borrowing commitment fee				0.125%					0.375%
Revolving credit facility expiration date				Aug. 26, 2018
Revolving credit facility					8,000
Line of Credit Facility, Commitment Fee Percentage				0.129%
Minimum borrowing capacity after dividend payment				5,000
Outstanding borrowings under the facility	0
Outstanding letters of credit				202
Debt facility balance borrowing availability						19,798
Amortization of loan origination fees	$ 19	$ 150	$ 116
Amount required to enter into an interest rate swap	not less than 50% of the term loan for the first two years and 35% of the term loan for the third year
Percentage of term loan to be entered into an interest rate swap during first two years	50.00%
Percentage of term loan to be entered into an interest rate swap during third year	35.00%
Fixed rate on interest rate swap	3.25%
Floating rate period	30 day LIBOR
Years required to enter into an interest rate swap	3 years