XML 97 R102.htm IDEA: XBRL DOCUMENT v2.4.0.6
Segment Reporting - Summary of Financial Information by Reportable Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Apr. 30, 2013
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2010
Jul. 31, 2010
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Segment Reporting Information [Line Items]                              
Outside revenues $ 108,694 $ 112,167 $ 116,836 $ 117,638 $ 106,375 $ 111,520 $ 125,989 $ 124,066 $ 106,772 $ 109,076 $ 119,694 $ 119,143 $ 455,335 $ 467,950 $ 454,685
Depreciation and amortization                         56,576 58,415 58,121
Operating income (loss) 2,110 78 4,426 5,807 (37,679) 4,448 11,730 10,468 (2,324) 6,571 12,263 12,918 12,421 (11,033) 29,428
Interest expense (net)                         41,429 44,966 45,489
Capital expenditures                         54,761 58,363 54,728
Goodwill 115,928       101,706       101,204       115,928 101,706 101,204
Total assets 659,627       633,743       690,581       659,627 633,743 690,581
Eastern region [Member]
                              
Segment Reporting Information [Line Items]                              
Outside revenues                         168,361 163,063 158,856
Inter-company revenue                         33,738 35,616 38,238
Depreciation and amortization                         24,410 25,993 25,081
Operating income (loss)                         (3,504) (42,130) (3,978)
Interest expense (net)                         26,509 31,019 23,195
Capital expenditures                         21,854 22,207 24,600
Goodwill 16,858       58       38       16,858 58 38
Total assets 210,889       177,185       223,229       210,889 177,185 223,229
Western region [Member]
                              
Segment Reporting Information [Line Items]                              
Outside revenues                         205,747 212,227 207,345
Inter-company revenue                         65,390 67,776 63,833
Depreciation and amortization                         26,446 26,168 26,897
Operating income (loss)                         20,058 29,715 32,163
Interest expense (net)                         (1,311) 80 2,487
Capital expenditures                         30,384 27,467 25,761
Goodwill 86,880       89,458       88,976       86,880 89,458 88,976
Total assets 348,455       333,381       335,163       348,455 333,381 335,163
Recycling [Member]
                              
Segment Reporting Information [Line Items]                              
Outside revenues                         39,131 47,934 43,557
Inter-company revenue                         (84) (248) (402)
Depreciation and amortization                         4,188 4,016 3,573
Operating income (loss)                         (456) 5,375 4,116
Interest expense (net)                         5,553 6,794 4,550
Capital expenditures                         915 5,485 1,764
Goodwill 12,190       12,190       12,190       12,190 12,190 12,190
Total assets 50,830       55,249       52,047       50,830 55,249 52,047
Other [Member]
                              
Segment Reporting Information [Line Items]                              
Outside revenues                         42,096 44,726 44,927
Inter-company revenue                         1,328 2,714 2,788
Depreciation and amortization                         1,532 2,238 2,570
Operating income (loss)                         (3,677) (3,993) (2,873)
Interest expense (net)                         10,678 7,073 15,257
Capital expenditures                         1,608 3,204 2,603
Total assets 49,453       67,928       80,142       49,453 67,928 80,142
Eliminations [Member]
                              
Segment Reporting Information [Line Items]                              
Inter-company revenue                         $ (100,372) $ (105,858) $ (104,457)