Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Increase (Decrease) In Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance	$ 685,036	$ 675,983	$ 701,296	$ 670,110
Total other comprehensive (loss) income, net of tax	(515)	672	(277)	(490)
Ending balance	684,948	680,847	684,948	680,847
Foreign Currency Translation Adjustments
Increase (Decrease) In Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance	(35,478)	(35,493)	(35,689)	(34,129)
Other comprehensive (loss) income before reclassifications	(630)	632	(419)	(732)
Income tax benefit (expense)	0	0
Other comprehensive (loss) income before reclassifications, net of tax	(630)	632	(419)	(732)
Amounts reclassified from accumulated other comprehensive loss	0	0
Income tax benefit	0	0
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0
Total other comprehensive (loss) income, net of tax	(630)	632	(419)	(732)
Ending balance	(36,108)	(34,861)	(36,108)	(34,861)
Pension Obligations, net
Increase (Decrease) In Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance	(3,047)	(2,906)	(3,074)	(3,108)
Other comprehensive (loss) income before reclassifications	0	0	(17)	208
Income tax benefit (expense)	0	0	4	(46)
Other comprehensive (loss) income before reclassifications, net of tax	0	0	(13)	162
Amounts reclassified from accumulated other comprehensive loss	148	52	200	104
Income tax benefit	(33)	(12)	(45)	(24)
Amounts reclassified from accumulated other comprehensive loss, net of tax	115	40	155	80
Total other comprehensive (loss) income, net of tax	115	40	142	242
Ending balance	(2,932)	(2,866)	(2,932)	(2,866)
Accumulated Other Comprehensive Loss
Increase (Decrease) In Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance	(38,525)	(38,399)	(38,763)	(37,237)
Other comprehensive (loss) income before reclassifications	(630)	632	(436)	(524)
Income tax benefit (expense)	0	0	4	(46)
Other comprehensive (loss) income before reclassifications, net of tax	(630)	632	(432)	(570)
Amounts reclassified from accumulated other comprehensive loss	148	52	200	104
Income tax benefit	(33)	(12)	(45)	(24)
Amounts reclassified from accumulated other comprehensive loss, net of tax	115	40	155	80
Total other comprehensive (loss) income, net of tax	(515)	672	(277)	(490)
Ending balance	$ (39,040)	$ (37,727)	$ (39,040)	$ (37,727)

Amount before tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).

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