v3.7.0.1
Acquisitions - Additional Information (Detail)
12 Months Ended
Jul. 23, 2015
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
acquisition
Business Acquisition [Line Items]        
Purchase of businesses   $ 12,392,000 $ 35,439,000 $ 0
Goodwill relating to acquisitions   1,122,000 14,395,000  
Estimated tax-deductible goodwill   $ 19,857,000 $ 20,766,000  
Number of businesses acquired | acquisition       0
ICS Industires Pty, Ltd [Member]        
Business Acquisition [Line Items]        
Purchase of businesses $ 34,496,000      
Estimated tax-deductible goodwill 0      
ICS Industires Pty, Ltd [Member] | Customer Relationships        
Business Acquisition [Line Items]        
Acquired intangible assets 10,211,000      
ICS Industires Pty, Ltd [Member] | Technology        
Business Acquisition [Line Items]        
Acquired intangible assets 1,399,000      
ICS Industires Pty, Ltd [Member] | Non-compete        
Business Acquisition [Line Items]        
Acquired intangible assets 142,000      
ICS Industires Pty, Ltd [Member] | Goodwill [Member]        
Business Acquisition [Line Items]        
Goodwill relating to acquisitions $ 13,898,000      
Minimum        
Business Acquisition [Line Items]        
Estimated useful lives of finite-lived assets   3 years    
Minimum | ICS Industires Pty, Ltd [Member] | Non-compete        
Business Acquisition [Line Items]        
Estimated useful lives of finite-lived assets 2 years      
Maximum        
Business Acquisition [Line Items]        
Estimated useful lives of finite-lived assets   20 years    
Maximum | ICS Industires Pty, Ltd [Member] | Technology        
Business Acquisition [Line Items]        
Estimated useful lives of finite-lived assets 10 years      
Maximum | ICS Industires Pty, Ltd [Member] | Non-compete        
Business Acquisition [Line Items]        
Estimated useful lives of finite-lived assets 5 years      
Average | ICS Industires Pty, Ltd [Member] | Customer Relationships        
Business Acquisition [Line Items]        
Estimated useful lives of finite-lived assets 11 years      
Trademarks | ICS Industires Pty, Ltd [Member]        
Business Acquisition [Line Items]        
Acquired indefinite-lived intangible assets $ 1,322,000