Quarterly report pursuant to Section 13 or 15(d)

Subsequent Event (Detail)

Subsequent Event (Detail) (Subsequent Event [Member], Credit Agreement [Member], USD $)
In Millions, unless otherwise specified
9 Months Ended
Apr. 30, 2013
Subsequent Event [Member] | Credit Agreement [Member]
Proceeds from Long-term Lines of Credit (in Dollars) $ 4.0
Debt Instrument Maturity Period December 2016
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars) $ 8.0
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum 1.25%
Debt Instrument, Basis Spread on Variable Rate 4.00%