Balance Sheet Information - Components of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) $ in Thousands	6 Months Ended
	Aug. 31, 2017 USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	$ 6,423
Other comprehensive income before reclassifications	2,140
Amounts reclassified from AOCI	10
Other comprehensive income	2,150
Ending balance	21,829
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(4,954)
Other comprehensive income before reclassifications	1,991
Amounts reclassified from AOCI	0
Other comprehensive income	1,991
Ending balance	(2,963)
Unrealized Gains (Losses) on Available-for- Sale Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(272)
Other comprehensive income before reclassifications	149
Amounts reclassified from AOCI	10
Other comprehensive income	159
Ending balance	(113)
AOCI Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Beginning balance	(5,226)
Ending balance	$ (3,076)