Changes in Carrying Value of Goodwill (Details) $ in Thousands	9 Months Ended
	May 31, 2018 USD ($)
Goodwill [Roll Forward]
Balance as of August 31, 2016	$ 530,081
Goodwill, Acquired During Period	12,085
Impact of changes in foreign currency rates	(3,374)
Balance as of May 31, 2018	538,792
Industrial
Goodwill [Roll Forward]
Balance as of August 31, 2016	103,875
Goodwill, Acquired During Period	2,277
Impact of changes in foreign currency rates	(593)
Balance as of May 31, 2018	105,559
Energy
Goodwill [Roll Forward]
Balance as of August 31, 2016	188,830
Goodwill, Acquired During Period	9,808
Impact of changes in foreign currency rates	148
Balance as of May 31, 2018	198,786
Engineered Solutions
Goodwill [Roll Forward]
Balance as of August 31, 2016	237,376
Goodwill, Acquired During Period	0
Impact of changes in foreign currency rates	(2,929)
Balance as of May 31, 2018	$ 234,447