Employee Benefit Plans (Tables)

3 Months Ended

Oct. 31, 2011

Employee Benefit Plans [Abstract]

Components Of Net Periodic Pension Costs

	Three Months Ended October 31,
	2011			2010
	(thousands of dollars)
Net periodic cost:
Service cost	$	3,898		$	3,972
Interest cost		4,893			4,810
Expected return on assets		(7,053	)		(6,840	)
Transition amount amortization		57			54
Prior service cost amortization		128			116
Actuarial loss amortization		1,443			810
Net periodic benefit cost	$	3,366		$	2,922