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Summary of Significant Accounting Policies (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Jan. 31, 2014
Jan. 31, 2013
Debt Instrument, Year of Maturity     2019  
Net Cash Provided By Used In Operating Activities, Originally Reported $ 29,300,000 $ 34,600,000   $ 171,300,000
Net Cash Provided By Used In Operating Activities, Revised 16,300,000 24,800,000   175,600,000
Net Cash Provided By Used In Investing Activities, Originally Reported 46,700,000 35,700,000   73,600,000
Net Cash Provided By Used In Investing Activities, Revised 33,700,000 25,900,000   77,900,000
Canyons Obligation [Member]
        
Debt Instrument, Fair Value Disclosure     $ 309,093,000  
Debt Instrument, Year of Maturity     2063