Stockholders' Equity - Range Of Exercise Prices (Details) - 2009 Stock Option Plan $ / shares in Units, $ in Thousands	3 Months Ended
	Feb. 28, 2018 USD ($) $ / shares shares
2009 Stock Option Plan
Outstanding at ending of the year (in shares) | shares	308,512
Weighted Avg. Exercise Price (in dollars per share)	$ 28.83
Weighted Avg. Remaining Contractual Life	4 years 10 months 24 days
Total Intrinsic Value | $	$ 2,322
$23.00-$28.00
2009 Stock Option Plan
Exercise prices, low end of range (in dollars per share)	$ 23.00
Exercise prices, high end of range (in dollars per share)	$ 28.00
Outstanding at ending of the year (in shares) | shares	124,293
Weighted Avg. Exercise Price (in dollars per share)	$ 26.67
Weighted Avg. Remaining Contractual Life	7 years 8 months 12 days
Total Intrinsic Value | $	$ 1,205
$28.00-$32.00
2009 Stock Option Plan
Exercise prices, low end of range (in dollars per share)	$ 28.00
Exercise prices, high end of range (in dollars per share)	$ 32.00
Outstanding at ending of the year (in shares) | shares	128,248
Weighted Avg. Exercise Price (in dollars per share)	$ 29.07
Weighted Avg. Remaining Contractual Life	3 years 9 months 18 days
Total Intrinsic Value | $	$ 935
$32.00-$39.00
2009 Stock Option Plan
Exercise prices, low end of range (in dollars per share)	$ 32.00
Exercise prices, high end of range (in dollars per share)	$ 39.00
Outstanding at ending of the year (in shares) | shares	55,971
Weighted Avg. Exercise Price (in dollars per share)	$ 33.11
Weighted Avg. Remaining Contractual Life	1 year
Total Intrinsic Value | $	$ 182