Valuation And Qualifying Accounts (Tables)

12 Months Ended

Jul. 31, 2011

Valuation And Qualifying Accounts

Valuation And Qualifying Accounts

			Additions
Description	Balance at Beginning of Period		Charged to Costs and Expenses		Charged to Other Accounts (A)			Deductions (B)			Balance at End of Period
Year ended July 31, 2011:
Allowance for doubtful accounts deducted from accounts receivable	$	6,315	$	482	$	481		$	(370	)	$	6,908
Year ended July 31, 2010:
Allowance for doubtful accounts deducted from accounts receivable	$	7,387	$	1,063	$	(293	)	$	(1,842	)	$	6,315
Year ended July 31, 2009:
Allowance for doubtful accounts deducted from accounts receivable	$	7,509	$	1,240	$	(534	)	$	(828	)	$	7,387