Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 31, 2013
Changes in components of accumulated other comprehensive loss
Balance at beginning of period	$ (6)
Other comprehensive income (loss)	(47)
Balance at end of period	(53)
Foreign Currency Translation Adjustments
Changes in components of accumulated other comprehensive loss
Balance at beginning of period	(3)
Other comprehensive income (loss)	(50)
Balance at end of period	(53)
Unrealized Gains (Losses) on Marketable Securities
Changes in components of accumulated other comprehensive loss
Balance at beginning of period	(3)
Other comprehensive income (loss)	$ 3