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Goodwill and Related Intangible Assets (Schedule of Goodwill Impairment Tests) (Details)
Oct. 31, 2014
Oct. 31, 2013
Minimum    
Goodwill [Line Items]    
WACC 12.90%rock_WeightedAverageCostOfCapital
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 11.10%rock_WeightedAverageCostOfCapital
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum    
Goodwill [Line Items]    
WACC 13.60%rock_WeightedAverageCostOfCapital
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 12.70%rock_WeightedAverageCostOfCapital
/ us-gaap_RangeAxis
= us-gaap_MaximumMember