Restricted Cash	9 Months Ended
Jul. 31, 2016
Restricted Cash and Investments [Abstract]
Restricted cash	Restricted Cash As of July 31, 2016, there was $34.7 million of restricted cash and cash equivalents pledged as collateral for letters of credit for certain banking requirements and contractual commitments, compared to $26.9 million of restricted cash and cash equivalents pledged as of October 31, 2015. The restricted cash balance for both periods presented includes $15.0 million which has been placed in a Grantor's Trust account to secure certain obligations under a 15-year service agreement and has been classified as long-term. The restricted cash balance as of July 31, 2016 also includes $9.1 million to support obligations of the power purchase and service agreements related to PNC Energy Capital, LLC sale-leaseback transactions. As of July 31, 2016 and October 31, 2015, outstanding letters of credit totaled $7.9 million and $8.7 million, respectively. These expire on various dates through April 2019.

Restricted Cash

As of July 31, 2016, there was $34.7 million of restricted cash and cash equivalents pledged as collateral for letters of credit for certain banking requirements and contractual commitments, compared to $26.9 million of restricted cash and cash equivalents pledged as of October 31, 2015. The restricted cash balance for both periods presented includes $15.0 million which has been placed in a Grantor's Trust account to secure certain obligations under a 15-year service agreement and has been classified as long-term. The restricted cash balance as of July 31, 2016 also includes $9.1 million to support obligations of the power purchase and service agreements related to PNC Energy Capital, LLC sale-leaseback transactions. As of July 31, 2016 and October 31, 2015, outstanding letters of credit totaled $7.9 million and $8.7 million, respectively. These expire on various dates through April 2019.