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ENTERPRISE WIDE INFORMATION (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Revenue from External Customer [Line Items]        
Revenue, Net $ 122,719us-gaap_SalesRevenueNet $ 128,589us-gaap_SalesRevenueNet $ 245,106us-gaap_SalesRevenueNet $ 249,778us-gaap_SalesRevenueNet
Laser Macro Products        
Revenue from External Customer [Line Items]        
Revenue, Net 48,374us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= rsti_LaserMacroProductsMember		 46,772us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= rsti_LaserMacroProductsMember		 96,082us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= rsti_LaserMacroProductsMember		 95,858us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= rsti_LaserMacroProductsMember
Laser Marking And Micro Products        
Revenue from External Customer [Line Items]        
Revenue, Net 55,902us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= rsti_LaserMarkingAndMicroProductsMember		 65,907us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= rsti_LaserMarkingAndMicroProductsMember		 113,509us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= rsti_LaserMarkingAndMicroProductsMember		 121,883us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= rsti_LaserMarkingAndMicroProductsMember
Components        
Revenue from External Customer [Line Items]        
Revenue, Net $ 18,443us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= rsti_ComponentsMember		 $ 15,910us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= rsti_ComponentsMember		 $ 35,515us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= rsti_ComponentsMember		 $ 32,037us-gaap_SalesRevenueNet
/ us-gaap_ProductOrServiceAxis
= rsti_ComponentsMember