Commitments and Contingencies (Tables)

9 Months Ended

Aug. 31, 2011

Commitments and Contingencies and Legal Matters [Abstract]

Changes in the Company warranty liability

	Nine Months Ended August 31,						Three Months Ended August 31,
	2011			2010			2011			2010
Balance at beginning of period	$	93,988		$	135,749		$	82,630		$	117,753
Warranties issued		3,236			3,720			1,255			1,783
Payments		(20,483	)		(35,210	)		(6,012	)		(17,958	)
Adjustments		(6,242	)		(2,329	)		(7,374	)		352
Balance at end of period	$	70,499		$	101,930		$	70,499		$	101,930