Financing Arrangement (Details) (USD $)	3 Months Ended	6 Months Ended	12 Months Ended
	Apr. 30, 2013	Jul. 31, 2013	Jan. 31, 2013
Financing Arrangements (Textual) [Abstract]
Maximum borrowing amount of revolving loan		$ 4,250,000
Interest rate on borrowings under the line of credit.		LIBOR plus 2.25%
Interest rate		2.25%
Maximum borrowing amount limit of letter of credit		10,000,000
Borrowings outstanding under bank financing arrangements		$ 0	$ 0
Expiration date of financing arrangements	May 31, 2015
Ratio of total funded debt to EBITDA		2	2
Fixed charge coverage ratio		1.25	1.25
Ratio of senior funded debt to EBITDA		1.50	1.50