Accounts Receivable and Allowance for Doubtful Receivables (Tables)

6 Months Ended

Aug. 31, 2012

Accounts Receivable and Allowance for Doubtful Receivables [Abstract]

Allowance for doubtful receivables

	Three months ended August 31,						Six months ended August 31,
	2012			2011			2012			2011
Balance at beginning of period	$	4,479		$	4,882		$	4,403		$	4,814
Bad debt expense		—			21			287			542
Recoveries		13			6			19			172
Accounts written off		(82	)		(76	)		(299	)		(695	)
Balance at end of period	$	4,410		$	4,833		$	4,410		$	4,833