Employee Benefit Plans (Tables)

6 Months Ended

Jan. 31, 2014

Employee Benefit Plans [Abstract]

Components Of Net Periodic Pension Costs

	Three Months Ended		Six Months Ended
	January 31,		January 31,
	2014	2013	2014	2013
	(thousands of dollars)
Net periodic cost:
Service cost	$           4,702	$          4,880	$       9,385	$       9,741
Interest cost	4,863	4,263	9,717	8,511
Expected return on assets	(7,656)	(7,055)	(15,279)	(14,092)
Prior service cost and transition amortization	148	161	296	320
Actuarial loss amortization	1,850	2,577	3,698	5,149
Net periodic benefit cost	$           3,907	$          4,826	$       7,817	$       9,629