Employee Benefit Plans (Tables)

12 Months Ended

Jul. 31, 2011

Employee Benefit Plans (Tables) [Abstract]

Schedule of Changes In Plans Accumulated Benefit Obligations

	2011			2010
Obligation at beginning of year	$	15,277		$	14,311
Service cost		666			662
Interest cost		694			795
Actuarial (gain)/loss		(955	)		967
Benefit payments		(671	)		(834	)
Plan amendments		—			(169	)
Settlements		—			(455	)
Obligation at end of fiscal year	$	15,011		$	15,277

Schedule of Amounts Recognized as Liabilities in the Accompanying Consolidated Balance Sheets

	2011		2010
Current liability	$	1,054	$	1,060
Noncurrent liability		13,957		14,217
	$	15,011	$	15,277

Schedule of Amounts Recognized as Other Comprehensive Income (Loss) in the Accompanying Consolidated Balance Sheets

	2011		2010
Net actuarial gain	$	3,131	$	2,252
Prior service credit		503		585
	$	3,634	$	2,837

Schedule of Net Periodic Benefit Costs

	Years Ended July 31,
	2011			2010			2009
Net periodic postretirement benefit cost included the following components:
Service cost — benefits attributed to service during the period	$	666		$	662		$	672
Prior service credit		(82	)		(64	)		(70	)
Interest cost on accumulated postretirement benefit obligation		694			795			842
Amortization of unrecognized gain		(76	)		(206	)		(308	)
Curtailment loss		—			—			393
Periodic postretirement benefit cost	$	1,202		$	1,187		$	1,529

Schedule of Assumptions Used

	2011			2010			2009
Weighted average discount rate used in determining accumulated postretirement benefit obligation liability		4.5	%		4.5	%		5.5	%
Weighted average discount rate used in determining net periodic benefit cost		4.5	%		5.5	%		6.8	%
Assumed health care trend rate used to measure APBO at July 31		8.0	%		8.0	%		8.0	%
Rate to which cost trend rate is assumed to decline (the ultimate trend rate)		5.5	%		5.5	%		5.5	%
Fiscal year the ultimate trend rate is reached		2017			2016			2015

Schedule of the Effect of a One Percentage Point Change in Assumed Health Care Cost Trend Rates

	One-Percentage		One-Percentage
	Point Increase		Point Decrease
Effect on future service and interest cost	$	13	$	(12	)
Effect on accumulated postretirement benefit obligation at July 31, 2011		185		(170	)

Schedule of Expected Benefit Payments

2012	$	1,054
2013		1,084
2014		1,148
2015		1,234
2016		1,304
2017 through 2021		7,791