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Significant Accounting Policies - Additional Information (Detail)
 2 Months Ended 3 Months Ended 12 Months Ended
May 21, 2018
$ / shares
shares
Mar. 31, 2016
USD ($)
Sep. 30, 2015
USD ($)
Mar. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
Customer
$ / shares
shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Aug. 10, 2015
shares
Significant Accounting Policies [Line Items]              
Allowance for doubtful accounts       $ 8,600,000 $ 10,700,000    
Bad debt expense       800,000      
Uncollectible accounts, wrote-off       2,900,000      
Notes receivable, total       2,300,000      
Notes receivable, current       $ 2,200,000      
Notes receivable interest rate       3.50%      
Notes Receivable basis spread on Prime rate       5.10%      
Notes receivable, maturity description       Remaining unpaid amounts, plus accrued interest, mature in fiscal 2019 and 2021.      
Inventories wrote down         8,492,000 $ 9,382,000  
Depreciable assets       $ 109,600,000 86,000,000 84,200,000  
Basis of valuation       Property, plant, and equipment are stated at cost.      
Depreciation method       straight-line basis over the estimated useful lives      
Impairment of Intangible Assets   $ 6,600,000 $ 28,400,000     34,999,000  
Impairment of long-lived and intangible assets       $ 0 0    
Reduction of prepaid sand liability         2,000,000 10,658,000  
Intangible Assets, Amortization Expense       4,400,000 $ 4,800,000 $ 12,900,000  
Amortization expense, expected, for fiscal year 2019       3,200,000      
Amortization expense, expected, for fiscal year 2020       2,200,000      
Amortization expense, expected, for fiscal year 2021       1,700,000      
Amortization expense, expected, for fiscal year 2022       1,700,000      
Amortization expense, expected, for fiscal year 2023       $ 1,700,000      
Number of additional shares authorized to be repurchased | shares             6,782,700
Outstanding authorization shares | shares             7,500,000
Repurchase of shares | shares       627,772 788,800 1,894,000  
Shares repurchased average price | $ / shares       $ 97.30 $ 76.08 $ 65.24  
Freight costs included in revenue and cost of goods sold       $ 158,300,000 $ 138,000,000 $ 139,500,000  
Accumulated other comprehensive loss       4,012,000 7,396,000    
Net of income taxes for accumulated other comprehensive loss       1,300,000      
Interest payments       28,900,000 19,000,000 16,900,000  
Net payments made for federal and state income taxes       69,400,000 76,100,000 63,900,000  
Maintenance and repair expenses       $ 107,300,000 $ 101,500,000 $ 95,100,000  
Stock options excluded from computation of diluted earnings per share | shares       98,362 513,262 688,420  
Stock options, average exercise price per share | $ / shares       $ 98.75 $ 80.59 $ 80.51  
Increase in gross profit       $ 800,000      
Decrease in other income       (800,000)      
ASU 2016-09 [Member]              
Significant Accounting Policies [Line Items]              
Cumulative effect reduction in retained earnings       700,000      
Impact to retained earnings       0      
Recognition of excess tax benefits in provision for income taxes       4,100,000      
ASU 2018-02 [Member]              
Significant Accounting Policies [Line Items]              
Reclassification of income tax effect from accumulated other comprehensive loss to retained earnings       $ 1,000,000      
Subsequent Event [Member]              
Significant Accounting Policies [Line Items]              
Repurchase of shares | shares 319,300            
Shares repurchased average price | $ / shares $ 101.39            
Stock repurchase remaining number of shares authorized to be repurchased | shares 3,870,128            
Sand [Member]              
Significant Accounting Policies [Line Items]              
Customer advances   $ 2,000,000       $ 2,000,000  
Date of contract termination       Jun. 30, 2016      
Customer Contracts And Relationships [Member]              
Significant Accounting Policies [Line Items]              
Intangible Assets, Net       $ 13,528,000 $ 15,957,000    
Oil and Gas Proppants [Member]              
Significant Accounting Policies [Line Items]              
Reduction of prepaid sand liability       2,000,000      
Number of customers terminated contract | Customer         2    
Settlement agreements, amount received         $ 12,900,000    
Oil and Gas Proppants [Member] | Customer Contracts And Relationships [Member]              
Significant Accounting Policies [Line Items]              
Intangible Assets, Net       $ 1,600,000      
Intangible assets, wrote-off due to termination of contract         1,300,000    
Oil and Gas Proppants [Member] | Raw Materials [Member]              
Significant Accounting Policies [Line Items]              
Inventories wrote down         7,700,000    
Oil and Gas Proppants [Member] | Materials-in-Process and Frac Sand [Member]              
Significant Accounting Policies [Line Items]              
Inventories wrote down         $ 800,000