Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.3.1.900
Debt (Details)
CAD in Millions, AUD in Millions
3 Months Ended
Dec. 31, 2015
USD ($)
period
letter_of_credit
Dec. 31, 2015
AUD
period
letter_of_credit
Dec. 31, 2015
CAD
period
letter_of_credit
Apr. 01, 2015
USD ($)
Mar. 09, 2015
USD ($)
Credit Agreement Expiring January 2020          
Debt Instrument [Line Items]          
Maximum borrowing capacity         $ 400,000,000
Debt instrument, face amount       $ 225,000,000  
Interest paid $ 800,000        
Credit Agreement Expiring January 2020 | U.S Dollar Borrowings          
Debt Instrument [Line Items]          
Amount borrowed 232,300,000        
Credit Agreement Expiring January 2020 | Canadian Dollar Borrowings          
Debt Instrument [Line Items]          
Amount borrowed 4,500,000   CAD 6.3    
Credit Agreement Expiring January 2020 | Australian Dollar Borrowings          
Debt Instrument [Line Items]          
Amount borrowed $ 7,300,000 AUD 10      
Credit Agreement Expiring January 2020 | Maximum          
Debt Instrument [Line Items]          
Leverage ratio 2.5        
Total leverage ratio 1.0        
Swingline Loans          
Debt Instrument [Line Items]          
Maximum borrowing capacity         5,000,000
Letters of Credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity         $ 30,000,000
Number of letters of credit issued | letter_of_credit 3 3 3    
Outstanding borrowings $ 700,000        
Atlantic Innovation Fund of Canada          
Debt Instrument [Line Items]          
Amount borrowed 800,000   CAD 1.1    
Interest expense, debt $ 0        
Number of remaining quarterly installments | period 26 26 26    
Letters of Credit (Other than Revolving Credit Agreement)          
Debt Instrument [Line Items]          
Number of letters of credit issued | letter_of_credit 2 2 2    
Outstanding borrowings $ 3,000,000