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Supplemental Guarantor Information Supplemental Guarantor Information (Level 4 Textuals) (Details)
Apr. 30, 2018
Entity Information [Line Items]  
Supplemental Guarantor Information, consolidated net worth of released guarantor subsidiary 5.00%
supplemental guarantor information, consolidated net worth of all released guarantor subsidiaries 10.00%
supplemental guarantor information, consolidated net worth, all released guarantor subs, default cure 15.00%
Subsidiary Issuer [Member]  
Entity Information [Line Items]  
Subsidiary of Company, Ownership Percentage by Parent 100.00%
Guarantor Subsidiaries [Member]  
Entity Information [Line Items]  
Subsidiary of Company, Ownership Percentage by Parent 100.00%