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Subsequent Event (Details) $ in Thousands		3 Months Ended		12 Months Ended
	Oct. 02, 2018 USD ($) ft²	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Oct. 31, 2018 USD ($) ft²
Subsequent Event [Line Items]
Assets held for sale			$ 5,220	$ 5,220	$ 0
Tax benefit related to disposal			1,100
Gain on sale of property, equipment and improvements				622	$ 0	$ 0
Minimum lease obligations			$ 8,619	$ 8,619
Subsequent Event
Subsequent Event [Line Items]
Term of lease							13 years
Minimum lease obligations							$ 15,900
Area of lease (in sqft) | ft²							59,497
Minnetonka, MN | Subsequent Event
Subsequent Event [Line Items]
Area of real estate sold (in sqft) | ft²	130,000
Proceeds from sale of building	$ 10,000
Forecast
Subsequent Event [Line Items]
Gain on sale of property, equipment and improvements		$ 4,500
Gain on sale of property, equipment and improvements, net of deferred taxes		$ 3,400

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Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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