CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
OPERATING ACTIVITIES
Net income	$ 14,230	$ 6,261
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation	30,975	35,199
Amortization	1,620	1,792
Bad debt expense	658	794
Other charges	2,957	3,962
Foreign currency gain		(27)
Deferred income taxes	(5,110)	(3,089)
Share-based compensation expense	1,386	1,183
Changes in assets and liabilities, net of effects of acquisitions-
Accounts receivable, net	(5,983)	(18,654)
Inventories	(7,586)	(5,055)
Prepaid expenses	2,895	2,673
Other assets	1,471	2,930
Accounts payable and accrued liabilities	995	10,155
Other liabilities	(3,662)	3,650
Income taxes payable	2,176	26
Net cash provided by operating activities	37,022	41,800
INVESTING ACTIVITIES
Acquisitions of businesses, net of cash acquired	(151)	(17)
Capital expenditures	(11,864)	(27,197)
Proceeds from asset dispositions	2,991	782
Net cash used in investing activities	(9,024)	(26,432)
FINANCING ACTIVITIES
Proceeds from bank credit facilities	39,203	58,762
Payments on bank credit facilities	(52,135)	(43,164)
Payments on term equipment notes and other debt	(13,337)	(12,200)
Payments to repurchase and retire common stock		(17,704)
Proceeds from exercise of stock options, including excess tax benefit	1,735	947
Net cash used in financing activities	(24,534)	(13,359)
Effect of exchange rate changes on cash and cash equivalents	362	92
NET INCREASE IN CASH AND CASH EQUIVALENTS	3,826	2,101
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	12,217	6,065
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 16,043	$ 8,166