Other Balance Sheet Details (Details 2) (USD $)	3 Months Ended	6 Months Ended
Jan. 31, 2011	Apr. 30, 2012	Apr. 30, 2011
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	$ 54,372,000	$ 47,282,000	$ 54,372,000
Provisions		16,615,000	5,646,000
Settlements		(12,793,000)	(12,766,000)
Balance at end of period		51,104,000	47,252,000
Reduction in warranty liability	$ (6,900,000)

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Represents the aggregate decrease in the liability related to payments to satisfy claims for standard and extended product warranties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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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).

+ References

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

-Publisher FASB

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The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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