Other Balance Sheet Details (Details) (USD $)	3 Months Ended		9 Months Ended
	Jan. 31, 2011	Jan. 31, 2010	Jul. 31, 2011	Jul. 31, 2010	Oct. 31, 2010
Other long-term assets
Maintenance spares inventory, net			$ 50,117,000		$ 53,654,000
Deferred debt issuance costs, net			24,815,000		28,853,000
Embedded redemption feature			7,600,000		4,220,000
Restricted cash			37,951,000		37,796,000
Other			5,318,000		5,296,000
Total			125,801,000		129,819,000
Other Balance Sheet Details (Textuals) [Abstract]
Amortization of debt issuance costs included in interest expense			4,000,000	2,600,000
Reduction in warranty liability due to lower expected costs	6,900,000
Warranty liability and cost of good sold reduction adjustment		$ 3,300,000