VAT Tax Issue in Brazil (Details 2)	Jul. 31, 2013 USD ($)		Jul. 31, 2013 BRL	Jan. 31, 2013 USD ($)	Jan. 31, 2013 BRL
Noncurrent assets ,VAT taxes eligible for future credit	$ 1.9	[1]	3.4	$ 3,400,000	1,900,000	[1]
Long-term liabilities, Taxes payable	$ 3,100,000	[1]	6.2	$ 6,200,000	3,100,000	[1]

[1] At exchange rate prevailing in 2010 when recorded.