Business combinations and disposals - Acquisition Related Contingent Consideration (Details) |
3 Months Ended | 12 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2016
USD ($)
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Jun. 30, 2016
USD ($)
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Mar. 31, 2016
USD ($)
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Dec. 31, 2015
USD ($)
|
Sep. 30, 2015
USD ($)
|
Jun. 30, 2015
USD ($)
|
Mar. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
Sep. 30, 2016
USD ($)
|
Sep. 30, 2015
USD ($)
|
Sep. 30, 2014
USD ($)
|
Sep. 30, 2016
CAD
|
Dec. 15, 2015
USD ($)
|
Sep. 30, 2015
CAD
|
Dec. 31, 2010
CAD
|
|
| Business combinations | |||||||||||||||
| Revenue | $ 623,091,000 | $ 617,094,000 | $ 606,453,000 | $ 556,722,000 | $ 578,683,000 | $ 572,301,000 | $ 481,794,000 | $ 467,043,000 | $ 2,403,360,000 | $ 2,099,821,000 | $ 1,700,912,000 | ||||
| DeltaWare | Sales targets | |||||||||||||||
| Business combinations | |||||||||||||||
| Contingent consideration arrangements, range of outcomes, value, high | CAD | CAD 4,000,000 | ||||||||||||||
| Revenue | 0 | ||||||||||||||
| Liability for potential obligation | CAD | CAD 0 | CAD 0 | |||||||||||||
| Assessments Australia | |||||||||||||||
| Business combinations | |||||||||||||||
| Contingent consideration arrangements, range of outcomes, value, high | $ 500,000 | ||||||||||||||
| Contingent consideration, liability | $ 400,000 | $ 400,000 | |||||||||||||
| X | ||||||||||
- Definition Represents the maximum amount of contingent consideration payable, based upon sales of acquiree products in particular geographic markets. No definition available.
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of liability recognized arising from contingent consideration in a business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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| X | ||||||||||
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| X | ||||||||||
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