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Commitments and Contingencies (Details) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	May 31, 2016 USD ($)	Jan. 31, 2016 USD ($) item	Aug. 31, 2017 USD ($)	Aug. 31, 2016 USD ($)	Aug. 31, 2017 USD ($)	Aug. 31, 2016 USD ($)
Accrual for warranty returns
Beginning balance			$ 20,629	$ 18,981	$ 21,766	$ 20,622
Additions to the accrual			13,943	13,671	26,182	28,194
Reductions of the accrual - payments and credits issued			(12,478)	(13,193)	(25,854)	(29,357)
Ending balance	$ 18,981		$ 22,094	$ 19,459	$ 22,094	$ 19,459
Minimum
Accrual for warranty returns
Product warranty period					2 years
Maximum
Accrual for warranty returns
Product warranty period					5 years
Thermometer Patent Litigation | Litigation
Commitments and contingencies
Number of models | item		2
Charge including legal fees and other related expenses		$ 17,800
Amount of additional pre-judgment compensation	$ 1,500

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Amount of additional judgment or settlement awarded to (against) the entity in respect of litigation including legal fees and other expenses.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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