CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
OPERATING ACTIVITIES
Net income	$ 22,225	$ 14,102	$ 41,412
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	69,672	68,506	65,106
Amortization	3,586	3,593	3,574
Bad debt expense	1,384	970	102
Goodwill impairment charge	949	1,984
Other charges	15,993	18,786	(1,945)
Foreign currency (gain) loss	(25)	50	87
Deferred income taxes	(4,885)	2,711	12,059
Share-based compensation expense	2,325	2,650	3,307
Changes in assets and liabilities, net of effects of acquisitions-
Accounts receivable, net	(4,684)	11,498	2,179
Inventories	(1,409)	(2,761)	(666)
Prepaid expenses	(985)	(1,528)	(4,021)
Other assets	3,896	2,141	(4,886)
Accounts payable and accrued liabilities	(4,752)	(16,161)	(4,814)
Other liabilities	(3,058)	1,649	(909)
Income taxes payable	(18)	2	(9,422)
Net cash provided by operating activities	100,214	108,192	101,163
INVESTING ACTIVITIES
Acquisitions of businesses, net of cash acquired	(129)	(3,399)	(7,224)
Capital expenditures	(38,852)	(59,965)	(68,752)
Proceeds from asset dispositions	3,218	3,209	3,905
Net cash used in investing activities	(35,763)	(60,155)	(72,071)
FINANCING ACTIVITIES
Proceeds from bank credit facilities	91,474	167,021	229,289
Payments on bank credit facilities	(111,453)	(181,092)	(234,787)
Proceeds from issuance of term equipment notes	1,591	24,052	25,508
Payments on term equipment notes and other debt	(22,027)	(16,123)	(33,820)
Payments to repurchase and retire common stock	(18,912)	(43,802)	(27,766)
Proceeds from exercise of stock options, including excess tax benefit	1,406	4,251	9,594
Net cash used in financing activities	(57,921)	(45,693)	(31,982)
Effect of exchange rate changes on cash and cash equivalents	(378)	11	(141)
NET INCREASE/(DECREASE) IN CASH AND CASH EQUIVALENTS	6,152	2,355	(3,031)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	6,065	3,710	6,741
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 12,217	$ 6,065	$ 3,710