PENSION AND OTHER POSTRETIREMENT BENEFITS Estimated future benefit payments (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012
Pension Benefits
Defined Benefit Plans and Postretirement Health Benefits
2013	$ 977
2014	1,096
2015	1,161
2016	1,198
2017	1,292
2018-22	8,101
Postretirement Health Benefits
Defined Benefit Plans and Postretirement Health Benefits
2013	75
2014	60
2015	87
2016	122
2017	137
2018-22	$ 886

The amount of the aggregate benefits expected to be paid in the five fiscal years thereafter (the aggregate amount of benefits expected to be paid in years 6 through 10 after the date of the latest statement of financial position).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant