Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2018	Nov. 30, 2017
Increase (Decrease) In Accumulated Other Comprehensive Loss [Roll Forward}
Beginning balance	$ 670,110	$ 537,493
Total other comprehensive loss, net of tax	(1,162)	(1,627)
Ending balance	675,983	551,617
Foreign Currency Translation Adjustments
Increase (Decrease) In Accumulated Other Comprehensive Loss [Roll Forward}
Beginning balance	(34,129)	(31,828)
Other comprehensive income (loss) before reclassifications	(1,364)	(1,709)
Income tax (expense) benefit	0	0
Other comprehensive income (loss) before reclassifications, net of tax	(1,364)	(1,709)
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, net of tax	(1,364)	(1,709)
Ending balance	(35,493)	(33,537)
Pension Obligations, net
Increase (Decrease) In Accumulated Other Comprehensive Loss [Roll Forward}
Beginning balance	(3,108)	(3,465)
Other comprehensive income (loss) before reclassifications	208	(185)
Income tax (expense) benefit	(46)	227
Other comprehensive income (loss) before reclassifications, net of tax	162	42
Amounts reclassified from accumulated other comprehensive loss	52	63
Income tax benefit	(12)	(23)
Amounts reclassified from accumulated other comprehensive loss, net of tax	40	40
Total other comprehensive loss, net of tax	202	82
Ending balance	(2,906)	(3,383)
Accumulated Other Comprehensive Loss
Increase (Decrease) In Accumulated Other Comprehensive Loss [Roll Forward}
Beginning balance	(37,237)	(35,293)
Other comprehensive income (loss) before reclassifications	(1,156)	(1,894)
Income tax (expense) benefit	(46)	227
Other comprehensive income (loss) before reclassifications, net of tax	(1,202)	(1,667)
Amounts reclassified from accumulated other comprehensive loss	52	63
Income tax benefit	(12)	(23)
Amounts reclassified from accumulated other comprehensive loss, net of tax	40	40
Total other comprehensive loss, net of tax	(1,162)	(1,627)
Ending balance	$ (38,399)	$ (36,920)