XML 74 R59.htm IDEA: XBRL DOCUMENT v3.8.0.1
Fair Value Measurements Reconciliation of Beginning and Ending Balances for Fair Value Measurements using Significant Unobservable Inputs (Detail) - Available For Sale Investments - USD ($)
$ in Thousands
12 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 800 $ 800
Purchases 0 0
Ending Balance $ 800 $ 800