Annual report pursuant to Section 13 and 15(d)

Changes in Carrying Value of Goodwill (Detail)

v3.8.0.1
Changes in Carrying Value of Goodwill (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Feb. 29, 2016
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Goodwill [Roll Forward]        
Beginning Balance $ 608,256 $ 519,276 $ 608,256  
Recognition of Goodwill due to Business acquired     45,967  
Goodwill, Purchase Accounting Adjustments   1,085    
Goodwill, Impairment Charge (118,122)   (118,462)  
Write off of goodwill related to a business divestiture     (3,778)  
Goodwill, Foreign Currency Translation Gain (Loss)   9,720 (12,707)  
Ending Balance   530,081 519,276 $ 608,256
Industrial        
Goodwill [Roll Forward]        
Beginning Balance 92,107 101,739 92,107  
Recognition of Goodwill due to Business acquired     9,726  
Goodwill, Purchase Accounting Adjustments   59    
Goodwill, Impairment Charge     0  
Write off of goodwill related to a business divestiture     0  
Goodwill, Foreign Currency Translation Gain (Loss)   2,195 (94)  
Ending Balance   103,875 101,739 92,107
Energy        
Goodwill [Roll Forward]        
Beginning Balance 236,450 187,321 236,450  
Recognition of Goodwill due to Business acquired     36,241  
Goodwill, Purchase Accounting Adjustments   1,144    
Goodwill, Impairment Charge     (73,919) (78,500)
Write off of goodwill related to a business divestiture     0  
Goodwill, Foreign Currency Translation Gain (Loss)   365 (11,451)  
Ending Balance   188,830 187,321 236,450
Engineered Solutions        
Goodwill [Roll Forward]        
Beginning Balance $ 279,699 230,216 279,699  
Recognition of Goodwill due to Business acquired     0  
Goodwill, Purchase Accounting Adjustments   0    
Goodwill, Impairment Charge     (44,543)  
Write off of goodwill related to a business divestiture     3,778  
Goodwill, Foreign Currency Translation Gain (Loss)   7,160 (1,162)  
Ending Balance   $ 237,376 $ 230,216 $ 279,699