Balance Sheet Information - Components of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) $ in Thousands	6 Months Ended
	Aug. 31, 2016 USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	$ (32,098)
Other comprehensive income (loss) before reclassifications	(4)
Amounts reclassified from AOCI	(732)
Other comprehensive loss	(736)
Ending balance	(15,761)
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(4,894)
Other comprehensive income (loss) before reclassifications	(374)
Amounts reclassified from AOCI	0
Other comprehensive loss	(374)
Ending balance	(5,268)
Unrealized Gains (Losses) on Available-for- Sale Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	385
Other comprehensive income (loss) before reclassifications	370
Amounts reclassified from AOCI	(732)
Other comprehensive loss	(362)
Ending balance	23
AOCI Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(4,509)
Ending balance	$ (5,245)