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Quarterly Results (unaudited) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 278,663	$ 302,395	$ 332,658	$ 297,504	$ 252,132	$ 277,409	$ 328,988	$ 284,963	$ 1,211,220	$ 1,143,492	$ 1,066,368
Gross Profit	61,500	87,380	91,210	71,955	57,361	68,865	44,294	61,097	312,045	231,617	254,133
Earnings Before Income Taxes	54,181	83,689	89,373	67,276	52,322	68,205	42,840	55,885	294,519	219,252	252,927
Net Earnings	$ 36,251	$ 56,387	$ 60,237	$ 45,344	$ 39,163	$ 45,848	$ 29,819	$ 37,762	$ 198,219	$ 152,592	$ 186,853
Diluted Earnings Per Share	$ 0.75	$ 1.17	$ 1.25	$ 0.93	$ 0.80	$ 0.92	$ 0.59	$ 0.75	$ 4.10	$ 3.05	$ 3.71

X

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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