Summary of Significant Accounting Policies (Details Textual) (USD $)	12 Months Ended
	Mar. 31, 2012 Y	Mar. 31, 2011	Mar. 31, 2010
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Period after which fee is presumed not fixed	12 months
Impairment of goodwill	$ 0
Excess amount deposited in excess of limit	132,400,000
Limit provided by banks and financial institutions for deposition	250,000
Credit terms available to debtors, minimum	30 days
Credit terms available to debtors, maximum	12 months
Maximum maturities period of cash and cash equivalents	90 days
Minimum amortization period of intangible assets	3
Maximum amortization period of intangible assets	9
Impairment on long-lived assets	0
Self insurance reserve	934,000	475,000
Advertising cost	$ 6,254,000	$ 7,122,000	$ 6,198,000
Stock Options [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Options excluded from the computation of diluted net income per share	335	514	150
Computer Equipment [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Useful life, minimum	3
Useful life, maximum	5
Furniture and Fixtures [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Useful life, minimum	5
Useful life, maximum	7
Furniture's and fixtures useful life lesser of lease term	lesser of lease term or estimated useful life of asset
Software and Software Development Costs [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives of the assets	7 years
Equipment and improvement [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives of the assets	3 Years