Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

Acquisitions and Other Business Activities (Narrative) (Details)

v3.2.0.727
Acquisitions and Other Business Activities (Narrative) (Details)
$ in Millions
1 Months Ended 6 Months Ended
Jul. 14, 2014
shares
Jul. 31, 2015
USD ($)
shares
Apr. 30, 2015
USD ($)
ft²
item
Jun. 30, 2015
USD ($)
Jul. 01, 2015
Consideration issued for acquisition     $ 38.0    
Area of new building space under construction | ft²     126,000    
Area of additional building rights | ft²     387,500    
Revolving Credit Facility [Member]          
Amount borrowed     $ 125.0    
Maturity term     5 years    
Amount outstanding     $ 175.0    
Maximum borrowing capacity     $ 250.0    
Solid Concepts Inc [Member]          
Ownership percentage 100.00%        
Shares issued to settle the first annual installment of the deferred payments, share | shares   118,789      
Shares issued to settle the first annual installment of the deferred payments   $ 4.1      
Cash paid to settle the first annual installment of the deferred payments   $ 0.5      
Potential retention related payments       $ 21.0  
Stock Issued During Period, Shares, Acquisitions | shares 978,601        
Solid Concepts Inc [Member] | Level 3 [Member]          
Fair value of the deferred payments       15.7  
Undiscounted amount of the deferred payments       $ 17.1  
Increase percentage in share price whose effect on fair value of deferred payments       10.00%  
Increase in fair value of deferred payments due to increase of share price       $ 1.6  
Decrease percentage in share price whose effect on fair value of deferred payments liability       10.00%  
Increase in fair value of deferred payments liability due to decrease of share price       $ 0.4  
Solid Concepts Inc [Member] | Retention-related and other payments [Member]          
Shares issued to settle the first annual installment of the deferred payments, share | shares   117,591      
Shares issued to settle the first annual installment of the deferred payments   $ 4.1      
Cash paid to settle the first annual installment of the deferred payments   $ 2.2      
MakerBot [Member]          
Number of stores | item     3    
Rapid Technologies GmbH [Member]          
Ownership percentage         100.00%