Annual report pursuant to Section 13 and 15(d)

SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Detail) - VALUATION AND QUALIFYING ACCOUNTS

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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Detail) - VALUATION AND QUALIFYING ACCOUNTS (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Allowance for Doubtful Accounts [Member]
     
Balance at Beginning of period $ 3,488 $ 2,839 $ 4,786
Charged to costs and expenses 5,104 4,431 3,480
Balance at end of period 3,273 3,488 2,839
Deductions 5,319 [1] 3,782 [1] 5,427 [1]
Valuation Allowance of Deferred Tax Assets [Member]
     
Balance at Beginning of period 32,920 28,901 21,716
Charged to costs and expenses 8,341 4,019 7,185
Balance at end of period $ 41,261 $ 32,920 $ 28,901
[1] Write-off of uncollectible accounts receivable.