Litigation (Details)	6 Months Ended
	Feb. 11, 2012 Plaintiffs
Litigation (Textual) [Abstract]
Number of Plaintiffs filed case	more than 200 plaintiffs
Number of Plaintiffs filed dismissal appeal	143
Maximum reimbursement percentage of qualified remediation cost	75.00%
Description of Reimbursement percentage of qualified remediation cost	up to 75 percent