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Quarterly Information - Adjustments for Error Corrections (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
May 31, 2016
Feb. 29, 2016
Nov. 30, 2015
Aug. 31, 2015
May 31, 2015
Feb. 28, 2015
Nov. 30, 2014
Aug. 31, 2014
Nov. 30, 2015
Nov. 30, 2014
Feb. 29, 2016
Feb. 28, 2015
May 31, 2016
May 31, 2015
May 31, 2014
May 31, 2013
May 31, 2012
Error Corrections and Prior Period Adjustments Restatement [Line Items]                                  
Net sales $ 93,419 $ 87,434 $ 89,284 $ 83,753 $ 90,697 $ 86,597 $ 92,149 $ 87,091 $ 173,037 $ 179,240 $ 260,471 $ 265,837 $ 353,890 $ 356,534 $ 354,425    
Cost of sales       40,382 45,366 48,924 45,321 41,127 83,782 86,448 127,682 135,372 179,574 180,738 174,251    
Gross profit 41,527 43,534 45,884 43,371 45,331 37,673 46,828 45,964 89,255 92,792 132,789 130,465 174,316 175,796 180,174    
Research and development       6,129 6,551 6,578 6,276 7,188 12,308 13,465 18,116 20,043 25,053 26,594 28,124 $ 26,091  
Sales and marketing   20,955 21,378 21,200 21,151 19,799 21,536 20,735 42,578 42,271 63,534 62,069 84,723 83,220 85,305 77,564 $ 65,757
General and administrative   6,901 8,082 7,914 7,448 6,613 7,786 7,315 15,996 15,101 22,897 21,714 29,603 29,162 26,902 26,035  
Amortization of intangibles           5,188 4,011 4,037   8,048   13,236 17,964 17,966 16,562 16,599 9,393
Change in fair value of contingent consideration           (9,794) 542 726   1,268   (8,526) 948 (8,096) (1,908)    
Acquisition, restructuring and other items, net           18,676 2,062     4,726   23,402 12,591 26,257 10,873    
Total operating expenses   41,568 45,319 43,159 44,202 48,094 43,289 43,660 88,478 86,949 130,047 135,043 173,298 179,245 169,687 163,272 130,553
Operating income (loss)   1,966 565 212 1,129 (10,421) 3,539 2,304 777 5,843   (4,578) 1,018 (3,449) 10,487 5,242 (5,244)
Other expense   (214) (239) (118) (230) (474) (374) (409) (357) (783) (570) (1,257) (886) (1,489) (1,645) (1,411) (991)
Total other expenses, net   (1,021) (1,236) (917) (977) (1,331) (1,166) (1,208) (2,153) (2,374) (3,173) (3,705) (4,271) (4,682) (5,301) (6,579) (409)
Income (loss) before income tax expense (benefit)   945 (671) (705) 152 (11,752) 2,373 1,096 (1,376) 3,469 (431) (8,283) (3,253) (8,131) 5,186 (1,337) (5,653)
Income tax expense (benefit)   351 (337) 70 740 (7,599) 1,304 812 (267) 2,116 84 (5,483) 40,337 (4,743) 2,839 (286) (322)
Net income (loss) (43,075) 594 (334) (775) (588) (4,153) 1,069 284 (1,109) 1,353 (515) (2,800) (43,590) (3,388) 2,347 (1,051) (5,331)
Foreign currency translation           (587) (67) 37   (30)   (618) (112) (264) 442    
Other comprehensive income (loss), before tax           (471) (63) 78   14   (458) 134 (88) 394    
Other comprehensive income (loss), net of tax           (514) (64) 63   (2)   (517) 42 (152) 412    
Total comprehensive income (loss), net of tax           (4,667) 1,005 347   1,351   (3,317) (43,548) (3,540) 2,759    
Inventories 55,370       67,388 68,767 75,372 71,306   75,372   68,767 55,370 67,388 61,740    
Prepaid expenses and other 3,243       4,132 4,638 6,562 6,466   6,562   4,638 3,243 4,132 4,880    
Total current assets 146,254       150,798 154,490 159,221 151,212   159,221   154,490 146,254 150,798 147,012    
Property, Plant and Equipment, net 48,284       54,450 58,215 66,723 66,189   66,723   58,215 48,284 54,450 66,455 62,375  
Other Assets 4,696     4,928 5,398 4,284 2,726 3,292   2,726   4,284 4,696 5,398 3,806    
Intangible Assets, net 166,577 167,926 172,357 177,245 181,652 186,393 197,187 201,215 172,357 197,187 167,926 186,393 166,577 181,652 205,053 214,523 147,195
Deferred Income Taxes, long term 0 19,818 20,050 19,689 19,508 19,540 11,878 13,267 20,050 11,878 19,818 19,540 0 19,508 15,256 18,009 44,277
Total Assets 727,063 753,614 760,441 771,998 773,058 783,395 798,729 796,169 760,441 798,729 753,614 783,395 727,063 773,058 798,576 790,561 719,903
Accounts payable 15,616       23,048 21,974           21,974 15,616 23,048      
Accrued liabilities 21,896   16,858   18,109 19,485 18,589 17,522 16,858 18,589   19,485 21,896 18,109 15,940 15,961  
Current portion of contingent consideration 12,919       9,969   9,545 10,722   9,545     12,919 9,969 10,818    
Other current liabilities 0 50 100 150 200       100   50   0 200 599    
Total current liabilities 66,727 61,629 60,087 60,801 60,515 59,504 57,099 63,354 60,087 57,099 61,629 59,504 66,727 60,515 65,941 62,920  
Deferred Income Taxes, long term 21,684       1,119               21,684 1,119      
Other Long Term Liabilities 908       0 628 692 539   692   628 908 0 531    
Total Liabilities 219,835 202,818 212,715 224,816 227,959 239,825 255,490 256,584 212,715 255,490 202,818 239,825 219,835 227,959 261,691 264,237  
Retained earnings (16,015) 27,060 26,466 26,800 27,575 28,163 32,316 31,247 26,466 32,316 27,060 28,163 (16,015) 27,575 30,963 28,616 29,667
Accumulated other comprehensive loss (791) (1,055) (1,187) (880) (833) (1,198) (683) (618) (1,187) (683) (1,055) (1,198) (791) (833) (681) (1,093) (980)
Total Stockholders' Equity 507,228 550,796 547,726 547,182 545,099 543,570 543,239 539,585 547,726 543,239 550,796 543,570 507,228 545,099 536,885 526,324 523,306
Total Liabilities and Stockholders' Equity $ 727,063 753,614 760,441 771,998 773,058 783,395 798,729 796,169 760,441 798,729 753,614 783,395 727,063 773,058 798,576 790,561 719,903
Net cash provided by (used in) operating activities       4,699       4,942 14,278 2,648 26,672 14,879 45,216 25,685 24,681    
Net cash provided by (used in) investing activities       (743)       (4,848) (1,143) (7,216) (3,888) (11,485) (7,569) (12,736) (16,448)    
Net cash provided by (used in) financing activities       (2,071)       (2,391) (12,370) 3,381 (19,167) 641 $ (23,663) (10,465) (14,016)    
As previously reported                                  
Error Corrections and Prior Period Adjustments Restatement [Line Items]                                  
Net sales   87,384 89,234 83,703 90,897     87,331 172,937 179,480 260,321 266,077   356,974      
Cost of sales       40,529 45,340 48,746 44,493 41,506 83,929 85,999 127,829 134,745   180,085 174,757    
Gross profit   43,484 45,834 43,174 45,557 37,851 47,656 45,825 89,008 93,481 132,492 131,332   176,889 179,668    
Research and development       6,202 7,289 6,855 6,069 6,718 12,381 12,787 18,189 19,642   26,931 27,486 26,319  
Sales and marketing   20,301 20,569 20,559 20,218 19,355 20,983 20,067 41,128 41,050 61,429 60,405   80,623 83,200 76,121 64,505
General and administrative   6,784 8,089 7,427 7,658 6,917 7,973 7,323 15,516 15,296 22,300 22,213   29,871 26,639 26,186  
Amortization of intangibles           5,106 4,061 4,015   8,076   13,182   17,912 16,622 16,617 9,309
Change in fair value of contingent consideration           (10,044) 617 801   1,418   (8,626)   (8,196) (1,808)    
Acquisition, restructuring and other items, net           18,779 2,302     4,966   23,745   26,600 10,760    
Total operating expenses   40,797 44,517 42,104 44,217 48,002 43,081 42,583 86,621 85,664 127,418 133,666   177,883 166,728 162,226 129,217
Operating income (loss)   2,687 1,317 1,070 1,340 (10,151) 4,575 3,242 2,387 7,817   (2,334)   (994) 12,940 6,288 (3,908)
Other expense   (868) (1,048) (945) (860) (971) (954) (1,025) (1,993) (1,979) (2,861) (2,950)   (3,812) (3,544) (2,707) (2,096)
Total other expenses, net   (1,675) (2,045) (1,744) (1,607) (1,828) (1,746) (1,824) (3,789) (3,570) (5,464) (5,398)   (7,005) (7,200) (7,875) (1,514)
Income (loss) before income tax expense (benefit)   1,012 (728) (674) (267) (11,979) 2,829 1,418 (1,402) 4,247 (390) (7,732)   (7,999) 5,740 (1,587) (5,422)
Income tax expense (benefit)   382 (366) 83 547 (7,717) 1,491 948 (283) 2,439 99 (5,278)   (4,731) 3,074 (376) (239)
Net income (loss)   630 (362) (757) (814) (4,262) 1,338 470 (1,119) 1,808 (489) (2,454)   (3,268) 2,666 (1,211) (5,183)
Foreign currency translation           (624) (104) 0   (104)   (728)   (411) 295    
Other comprehensive income (loss), before tax           (508) (100) 41   (60)   (568)   (235) 247    
Other comprehensive income (loss), net of tax           (551) (101) 26   (76)   (627)   (299) 265    
Total comprehensive income (loss), net of tax           (4,813) 1,237 496   1,732   (3,081)   (3,567) 2,931    
Inventories           68,710 75,315 70,421   75,315   68,710     61,234    
Prepaid expenses and other         4,783 4,859 6,753 6,777   6,753   4,859   4,783 5,471    
Total current assets         151,449 154,654 159,355 150,638   159,355   154,654   151,449 147,097    
Property, Plant and Equipment, net         54,560 58,295 67,552 66,794   67,552   58,295   54,560 66,590 62,391  
Other Assets       4,818 5,288 4,060 2,741 3,345   2,741   4,060   5,288 3,926    
Intangible Assets, net   168,080 172,511 177,399 181,806 186,547 197,362 201,440 172,511 197,362 168,080 186,547   181,806 205,256 214,673 147,363
Deferred Income Taxes, long term   19,563 19,826 19,436 19,268 19,107 11,327 12,903 19,826 11,327 19,563 19,107   19,268 15,028 18,016 44,194
Total Assets   753,513 760,371 771,789 773,623 783,136 799,331 796,114 760,371 799,331 753,513 783,136   773,623 798,891 790,734 719,988
Accounts payable         23,668 21,696           21,696   23,668      
Accrued liabilities     16,975   18,331 19,946 19,177 17,700 16,975 19,177   19,946   18,331 16,652 16,356  
Current portion of contingent consideration             9,795 10,897   9,795         10,918    
Other current liabilities   0 0 0 0       0   0     0 599    
Total current liabilities   61,579 60,104 60,651 61,157 59,687 57,937 63,707 60,104 57,937 61,579 59,687   61,157 66,753 63,315  
Other Long Term Liabilities           0 124 32   124   0     84    
Total Liabilities   202,768 212,732 224,666 228,601 239,380 255,760 256,430 212,732 255,760 202,768 239,380   228,601 262,056 264,632  
Retained earnings   27,744 27,114 27,476 28,233 29,047 33,309 31,971 27,114 33,309 27,744 29,047   28,233 31,501 28,835 30,046
Accumulated other comprehensive loss   (1,790) (1,922) (1,615) (1,568) (1,896) (1,345) (1,243) (1,922) (1,345) (1,790) (1,896)   (1,568) (1,269) (1,534) (1,274)
Total Stockholders' Equity   550,745 547,639 547,123 545,022 543,756 543,571 539,684 547,639 543,571 550,745 543,756   545,022 536,835 526,102 523,391
Total Liabilities and Stockholders' Equity   753,513 760,371 771,789 773,623 783,136 799,331 796,114 760,371 799,331 753,513 783,136   773,623 798,891 790,734 719,988
Net cash provided by (used in) operating activities       4,699       5,352 14,278 3,205 26,672 15,436   26,242 24,681    
Net cash provided by (used in) investing activities       (743)       (5,258) (1,143) (7,773) (3,888) (12,042)   (13,293) (16,448)    
Net cash provided by (used in) financing activities       (2,071)       (2,391) (12,370) 3,381 (19,167) 641   (10,465) (14,016)    
Adjustments                                  
Error Corrections and Prior Period Adjustments Restatement [Line Items]                                  
Net sales   50 50 50 (200)     (240) 100 (240) 150 (240)   (440)      
Cost of sales       (147) 26 178 828 (379) (147) 449 (147) 627   653 (506)    
Gross profit   50 50 197 (226) (178) (828) 139 247 (689) 297 (867)   (1,093) 506    
Research and development       (73) (738) (277) 207 470 (73) 678 (73) 401   (337) 638 (228)  
Sales and marketing   654 809 641 933 444 553 668 1,450 1,221 2,105 1,664   2,597 2,105 1,443 1,252
General and administrative   117 (7) 487 (210) (304) (187) (8) 480 (195) 597 (499)   (709) 263 (151)  
Amortization of intangibles           82 (50) 22   (28)   54   54 (60) (18) 84
Change in fair value of contingent consideration           250 (75) (75)   (150)   100   100 (100)    
Acquisition, restructuring and other items, net           (103) (240)     (240)   (343)   (343) 113    
Total operating expenses   771 802 1,055 (15) 92 208 1,077 1,857 1,285 2,629 1,377   1,362 2,959 1,046 1,336
Operating income (loss)   (721) (752) (858) (211) (270) (1,036) (938) (1,610) (1,974)   (2,244)   (2,455) (2,453) (1,046) (1,336)
Other expense   654 809 827 630 497 580 616 1,636 1,196 2,291 1,693   2,323 1,899 1,296 1,105
Total other expenses, net   654 809 827 630 497 580 616 1,636 1,196 2,291 1,693   2,323 1,899 1,296 1,105
Income (loss) before income tax expense (benefit)   (67) 57 (31) 419 227 (456) (322) 26 (778) (41) (551)   (132) (554) 250 (231)
Income tax expense (benefit)   (31) 29 (13) 193 118 (187) (136) 16 (323) (15) (205)   (12) (235) 90 (83)
Net income (loss)   (36) 28 (18) 226 109 (269) (186) 10 (455) (26) (346)   (120) (319) 160 (148)
Foreign currency translation           37 37 37   74   110   147 147    
Other comprehensive income (loss), before tax           37 37 37   74   110   147 147    
Other comprehensive income (loss), net of tax           37 37 37   74   110   147 147    
Total comprehensive income (loss), net of tax           146 (232) (149)   (381)   (236)   27 (172)    
Inventories           57 57 885   57   57     506    
Prepaid expenses and other         (651) (221) (191) (311)   (191)   (221)   (651) (591)    
Total current assets         (651) (164) (134) 574   (134)   (164)   (651) (85)    
Property, Plant and Equipment, net         (110) (80) (829) (605)   (829)   (80)   (110) (135) (16)  
Other Assets       110 110 224 (15) (53)   (15)   224   110 (120)    
Intangible Assets, net   (154) (154) (154) (154) (154) (175) (225) (154) (175) (154) (154)   (154) (203) (150) (168)
Deferred Income Taxes, long term   255 224 253 240 433 551 364 224 551 255 433   240 228 (7) 83
Total Assets   101 70 209 (565) 259 (602) 55 70 (602) 101 259   (565) (315) (173) (85)
Accounts payable         (620) 278           278   (620)      
Accrued liabilities     (117)   (222) (461) (588) (178) (117) (588)   (461)   (222) (712) (395)  
Current portion of contingent consideration             (250) (175)   (250)         (100)    
Other current liabilities   50 100 150 200       100   50     200 0    
Total current liabilities   50 (17) 150 (642) (183) (838) (353) (17) (838) 50 (183)   (642) (812) (395)  
Other Long Term Liabilities           628 568 507   568   628     447    
Total Liabilities   50 (17) 150 (642) 445 (270) 154 (17) (270) 50 445   (642) (365) (395)  
Retained earnings   (684) (648) (676) (658) (884) (993) (724) (648) (993) (684) (884)   (658) (538) (219) (379)
Accumulated other comprehensive loss   735 735 735 735 698 662 625 735 662 735 698   735 588 441 294
Total Stockholders' Equity   51 87 59 77 (186) (332) (99) 87 (332) 51 (186)   77 50 222 (85)
Total Liabilities and Stockholders' Equity   $ 101 $ 70 209 $ (565) $ 259 $ (602) 55 70 (602) 101 259   (565) (315) $ (173) $ (85)
Net cash provided by (used in) operating activities       0       (410) 0 (557) 0 (557)   (557) 0    
Net cash provided by (used in) investing activities       0       410 0 557 0 557   557 0    
Net cash provided by (used in) financing activities       $ 0       $ 0 $ 0 $ 0 $ 0 $ 0   $ 0 $ 0