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Business and Basis of Presentation (Effects of Recently Adopted Accounting Pronouncement) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Apr. 01, 2018
Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Accounts receivable, net $ 153,849 $ 146,319 $ 140,881
Inventories 113,569 116,779 118,547
Other accrued liabilities 70,057 54,026 52,101
Deferred income tax liabilities 440,853 442,919 442,518
Retained earnings $ 802,927 737,621 736,277
Calculated under Revenue Guidance in Effect before Topic 606      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Accounts receivable, net     140,881
Inventories     118,547
Other accrued liabilities     52,101
Deferred income tax liabilities     442,518
Retained earnings     $ 736,277
Difference between Revenue Guidance in Effect before and after Topic 606 | New Revenue Standard Adjustment      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Accounts receivable, net   5,438  
Inventories   (1,768)  
Other accrued liabilities   1,925  
Deferred income tax liabilities   401  
Retained earnings   $ 1,344