Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2013	May 31, 2012
Numerator:
Net income	$ 22,440	$ 13,740	$ 35,953	$ 30,879
Denominator:
Weighted average shares outstanding	46,446,993	46,306,147	46,435,289	46,348,345
Weighted Average Number Diluted Shares Outstanding Adjustment	17,058	10,272	15,278	10,113
Diluted weighted average shares outstanding	46,464,051	46,316,419	46,450,567	46,358,458
Basic and diluted earnings per share	$ 0.48	$ 0.30	$ 0.77	$ 0.67
Anti-dilutive shares excluded in the computation of diluted earnings per share	215,246	232,488	219,699	238,192