Warranties - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Oct. 26, 2012	Oct. 28, 2011
Product Warranty Liability [Line Items]
Increase in liability for pre-existing warranties related to the mining equipment	$ 20,013	$ 1,833
Surface Mining Equipment [Member]
Product Warranty Liability [Line Items]
Increase in liability for pre-existing warranties related to the mining equipment	$ 16,100

Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard and extended product warranties (including adjustments for changes in estimates).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(4))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Name:	us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration