Quarterly Results (Unaudited) (Tables)

12 Months Ended

Nov. 30, 2011

Quarterly Results (unaudited) [Abstract]

Consolidated quarterly results

	First			Second			Third			Fourth
2011
Revenues	$	196,940		$	271,738		$	367,316		$	479,872
Gross profit		25,279			20,570			63,579			72,941
Pretax income (loss)		(114,126	)		(68,804	)		(9,649	)		11,411
Net income (loss)		(114,526	)		(68,504	)		(9,649	)		13,911
Basic and diluted earnings (loss) per share	$	(1.49	)	$	(.89	)	$	(.13	)	$	.18
2010
Revenues	$	263,978		$	374,052		$	501,003		$	450,963
Gross profit		36,545			66,217			88,436			87,391
Pretax income (loss)		(54,504	)		(30,609	)		(6,697	)		15,442
Net income (loss)		(54,704	)		(30,709	)		(1,397	)		17,442
Basic and diluted earnings (loss) per share	$	(.71	)	$	(.40	)	$	(.02	)	$	.23